A man who dares to waste one hour of time has not discovered the value of life.

For my own part I would as soon be descended from that heroic little monkey, who braved his dreaded enemy in order to save the life of his keeper; or from that old baboon, who, descending from the mountains, carried away in triumph his young comrade from a crowd of astonished dogs—as from a savage...

Blushing is the most peculiar and most human of all expressions.

Ignorance more frequently begets confidence than does knowledge: it is those who know little, not those who know much, who so positively assert that this or that problem will never be solved by science.

If I had my life to live over again, I would have made a rule to read some poetry and listen to some music at least once every week.

One hand has surely worked throughout the universe.

It is difficult to believe in the dreadful but quiet war lurking just below the serene facade of nature.

This survival of the fittest implies multiplication of the fittest.{The phrase ‘survival of the fittest’ was not originated by Charles Darwin, though he discussed Spencer’s ‘excellent expression’ in a letter to Alfred Russel Wallace (Jul 1866).}

I fully agree with all that you say on the advantages of H. Spencer’s excellent expression of ‘the survival of the fittest.’ This, however, had not occurred to me till reading your letter. It is, however, a great objection to this term that it cannot be used as a substantive governing a verb; and that...

[Alexander von Humboldt was the] greatest scientific traveller who ever lived.

The publication in 1859 of the Origin of Species by Charles Darwin made a marked epoch in my own mental development, as it did in that of human thought generally. Its effect was to demolish a multitude of dogmatic barriers by a single stroke, and to arouse a spirit of rebellion against all ancient authorities...

As natural selection acts by competition, it adapts the inhabitants of each country only in relation to the degree of perfection of their associates; so that we need feel no surprise at the inhabitants of any one country, although on the ordinary view supposed to have been specially created and adapted for that country, being...

But then arises the doubt, can the mind of man, which has, as I fully believe been developed from a mind as low as that possessed by the lowest animal, be trusted when it draws such grand conclusions?

I have tried lately to read Shakespeare, and found it so intolerably dull that it nauseated me.

In the future I see open fields for more important researches. Psychology will be securely based on the foundation already laid by Mr. Herbert Spencer, that of the necessary acquirement of each mental power and capacity by graduation.

But when on shore, & wandering in the sublime forests, surrounded by views more gorgeous than even Claude ever imagined, I enjoy a delight which none but those who have experienced it can understand – If it is to be done, it must be by studying Humboldt.

The limit of man s knowledge in any subject possesses a high interest which is perhaps increased by its close neighbourhood to the realms of imagination.

False facts are highly injurious to the progress of science, for they often endure long; but false views, if supported by some evidence, do little harm, for everyone takes a salutary pleasure in proving their falseness; and when this is done, one path towards error is closed and the road to truth is often at...

Englishmen rarely cry, except under the pressure of the acutest grief; whereas in some parts of the Continent the men shed tears much more readily and freely.

To kill an error is as good a service as, and sometimes even better than, the establishing of a new truth or fact.

Man is descended from a hairy, tailed quadruped, probably arboreal in its habits.

What a book a devil’s chaplain might write on the clumsy, wasteful, blundering, low, and horribly cruel work of nature!

We must, however, acknowledge, as it seems to me, that man with all his noble qualities… still bears in his bodily frame the indelible stamp of his lowly origin.

The mystery of the beginning of all things is insoluble by us; and I for one must be content to remain an agnostic.

I love fools’ experiments. I am always making them.

An American monkey, after getting drunk on brandy, would never touch it again, and thus is much wiser than most men.

The following proposition seems to me in a high degree probable—namely, that any animal whatever, endowed with well-marked social instincts, the parental and filial affections being here included, would inevitably acquire a moral sense or conscience, as soon as its intellectual powers had become as well, or nearly as well developed, as in man. For,...

We cannot fathom the marvelous complexity of an organic being; but on the hypothesis here advanced this complexity is much increased. Each living creature must be looked at as a microcosm–a little universe, formed of a host of self-propagating organisms, inconceivably minute and as numerous as the stars in heaven.

I could show fight on natural selection having done and doing more for the progress of civilization than you seem inclined to admit. Remember what risk the nations of Europe ran, not so many centuries ago of being overwhelmed by the Turks, and how ridiculous such an idea now is! The more civilised so-called Caucasian...

It is often attempted to palliate slavery by comparing the state of slaves with our poorer countrymen: if the misery of our poor be caused not by the laws of nature, but by our institutions, great is our sin; but how this bears on slavery, I cannot see; as well might the use of the...

There is grandeur in this view of life, with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have...

The expression often used by Mr. Herbert Spencer of the Survival of the Fittest is more accurate, and is sometimes equally convenient.

Man tends to increase at a greater rate than his means of subsistence.

How paramount the future is to the present when one is surrounded by children.

A scientific man ought to have no wishes, no affections, – a mere heart of stone.

On the ordinary view of each species having been independently created, we gain no scientific explanation.

Animals, whom we have made our slaves, we do not like to consider our equal.

A moral being is one who is capable of reflecting on his past actions and their motives – of approving of some and disapproving of others.

The highest possible stage in moral culture is when we recognize that we ought to control our thoughts.

A man’s friendships are one of the best measures of his worth.

Freedom of thought is best promoted by the gradual illumination of men’s minds which follows from the advance of science.

As many more individuals of each species are born than can possibly survive; and as, consequently, there is a frequently recurring struggle for existence, it follows that any being, if it vary however slightly in any manner profitable to itself, under the complex and sometimes varying conditions of life, will have a better chance of...

…Whilst on board the Beagle I was quite orthodox, and I remember being heartily laughed at by several of the officers… for quoting the Bible as an unanswerable authority on some point of morality… But I had gradually come by this time, i.e., 1836 to 1839, to see that the Old Testament from its manifestly...

But just in proportion as this process of extermination has acted on an enormous scale, so must the number of intermediate varieties, which have formerly existed, be truly enormous. Why then is not every geological formation and every stratum full of such intermediate links? Geology assuredly does not reveal any such finely graduated organic chain;...

To suppose that the eye with all its inimitable contrivances for adjusting the focus to different distances, for admitting different amounts of light, and for the correction of spherical and chromatic aberration, could have been formed by natural selection, seems, I confess, absurd in the highest degree…The difficulty of believing that a perfect and complex...

Nothing is easier than to admit in words the truth of the universal struggle for life, or more difficult–at least I have found it so–than constantly to bear this conclusion in mind.

One general law, leading to the advancement of all organic beings, namely, multiply, vary, let the strongest live and the weakest die.

We can allow satellites, planets, suns, universe, nay whole systems of universe, to be governed by laws, but the smallest insect, we wish to be created at once by special act.

It may be worth while to illustrate this view of classification, by taking the case of languages. If we possessed a perfect pedigree of mankind, a genealogical arrangement of the races of man would afford the best classification of the various languages now spoken throughout the world; and if all extinct languages, and all intermediate...

If the misery of the poor be caused not by the laws of nature, but by our institutions, great is our sin.