Charles Darwin
Ignorance more frequently begets confidence than does knowledge: it is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science.Collection: Science
An American monkey, after getting drunk on brandy, would never touch it again, and thus is much wiser than most men.Collection: Men
If the misery of the poor be caused not by the laws of nature, but by our institutions, great is our sin.Collection: Nature
To kill an error is as good a service as, and sometimes even better than, the establishing of a new truth or fact.Collection: Truth
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 every one takes a salutary pleasure in proving their falseness.Collection: Science
I cannot persuade myself that a beneficent and omnipotent God would have designedly created parasitic wasps with the express intention of their feeding within the living bodies of Caterpillars.Collection: God
On the ordinary view of each species having been independently created, we gain no scientific explanation.Collection: Science
A man who dares to waste one hour of time has not discovered the value of life.Collection: Time
The very essence of instinct is that it's followed independently of reason.Collection: Brainy
How paramount the future is to the present when one is surrounded by children.Collection: Future
I love fools' experiments. I am always making them.Collection: Love
A man's friendships are one of the best measures of his worth.Collection: Friendship
At some future period, not very distant as measured by centuries, the civilized races of man will almost certainly exterminate, and replace the savage races throughout the world.Collection: Future
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.
I have steadily endeavoured to keep my mind free so as to give up any hypothesis, however much beloved (and I cannot resist forming one on every subject), as soon as facts are shown to be opposed to it.
What a book a devil's chaplain might write on the clumsy, wasteful, blundering, low, and horribly cruel work of nature!
The mystery of the beginning of all things is insoluble by us; and I for one must be content to remain an agnostic.
I have tried lately to read Shakespeare, and found it so intolerably dull that it nauseated me.
A scientific man ought to have no wishes, no affections, - a mere heart of stone.
I have called this principle, by which each slight variation, if useful, is preserved, by the term of Natural Selection.
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.
Man is descended from a hairy, tailed quadruped, probably arboreal in its habits.
We can allow satellites, planets, suns, universe, nay whole systems of universes, to be governed by laws, but the smallest insect, we wish to be created at once by special act.
The highest possible stage in moral culture is when we recognize that we ought to control our thoughts.
I am turned into a sort of machine for observing facts and grinding out conclusions.
Man tends to increase at a greater rate than his means of subsistence.
It is a cursed evil to any man to become as absorbed in any subject as I am in mine.
My mind seems to have become a kind of machine for grinding general laws out of large collections of facts.
Animals, whom we have made our slaves, we do not like to consider our equal.
It is not the strongest of the species that survives, nor the most intelligent that survives. It is the one that is the most adaptable to change, that lives within the means available and works co-operatively against common threats.Collection: Mean
The most important factor in survival is neither intelligence nor strength but adaptability.Collection: Survival
The world will not be inherited by the strongest, it will be inherited by those most able to change.Collection: World
The love for all living creatures is the most noble attribute of man.Collection: Love
Nothing exists for itself alone, but only in relation to other forms of lifeCollection: Form
It is not the biggest, the brightest or the best that will survive, but those who adapt the quickest.Collection: Leadership
Building a better mousetrap merely results in smarter mice.Collection: Building
Some call it evolution, And others call it God.Collection: Evolution
The more one thinks, the more one feels the hopeless immensity of man's ignorance.Collection: Ignorance
The impossibility of conceiving that this grand and wondrous universe, with our conscious selves, arose through chance, seems to me the chief argument for 
the existence of God.Collection: Self
Ignorance more frequently begets confidence than does knowledge.Collection: Inspirational
In the long history of humankind (and animal kind, too) those who learned to collaborate and improvise most effectively have prevailed.Collection: Teamwork
It's not the strongest, but the most adaptable that survive.Collection: Strongest
The willing horse is always overworked.Collection: Horse
It is not the most intellectual of the species that survives; it is not the strongest that survives; but the species that survives is the one that is able best to adapt and adjust to the changing environment in which it finds itself.Collection: Intellectual
There is no fundamental difference between man and animals in their ability to feel pleasure and pain, happiness, and misery.Collection: Pain
we are always slow in admitting any great change of which we do not see the intermediate stepsCollection: Steps
It is impossible to concieve of this immense and wonderful universe as the result of blind chance or necessity.Collection: Chance
Intelligence is based on how efficient a species became at doing the things they need to survive.Collection: Inspirational
Not one change of species into another is on record ... we cannot prove that a single species has been changed.Collection: Records
In my most extreme fluctuations I have never been an atheist in the sense of denying the existence of a God ... I think that generally (& more and more so as I grow older) but not always, that an agnostic would be the most correct description of my state of mind.Collection: Atheist