The only people, scientific or other, who never make mistakes are those who do nothing.
To a clear eye the smallest fact is a window through which the infinite may be seen.
People may talk about intellectual teaching, but what we principally want is the moral teaching.
When I reached intellectual maturity and began to ask myself whether I was an atheist, a theist, or a pantheist; a materialist, or an idealist; a Christian, or a freethinker; I found that the more I learned and reflected, the less ready was the answer; until, at last, I came to the conclusion that I had neither art nor part with any of these denominations, except the last.
The foundation of all morality is to have done, once and for all, with lying; to give up pretending to believe that for which there is no evidence, and repeating unintelligible propositions about things beyond the possibilities of knowledge.
And you very soon find out, if you have not found it out before, that patience and tenacity of purpose are worth more than twice their weight of cleverness.
What would become of the garden if the gardener treated all the weeds and slugs and birds and trespassers as he would like to be treated, if he were in their place?
There is no sadder sight in the world than to see a beautiful theory killed by a brutal fact.
Economy does not lie in sparing money, but in spending it wisely.
God give me strength to face a fact though it slay me.
A man's worst difficulties begin when he is able to do as he likes.
Without seeing any reason to believe that women are, on the average, so strong physically, intellectually, or morally, as men, I cannot shut my eyes to the fact that many women are much better endowed in all these respects than many men, and I am at a loss to understand on what grounds of justice or public policy a career which is open to the weakest and most foolish of the male sex should be forcibly closed to women of vigor and capacity.
'Infidel' is a term of reproach, which Christians and Mohammedans, in their modesty, agree to apply to those who differ from them.
There is but one right, and the possibilities of wrong are infinite.
The great end of life is not knowledge but action.
A drop of water is as powerful as a thunder-bolt.
Life is too short to occupy oneself with the slaying of the slain more than once.
And when you cannot prove that people are wrong, but only that they are absurd, the best course is to let them alone.
Action is the catalyst that creates accomplishments. It is the path that takes us from uncrafted hopes to realized dreams.
The rung of a ladder was never meant to rest upon, but only to hold a man's foot long enough to enable him to put the other somewhat higher.
The rules of the game are what we call the laws of nature.
Make up your mind to act decidedly and take the consequences. No good is ever done in this world by hesitation.
The improver of natural knowledge absolutely refuses to acknowledge authority, as such. For him, skepticism is the highest of duties; blind faith the one unpardonable sin.
Not far from the invention of fire we must rank the invention of doubt.
The man of science has learned to believe in justification, not by faith, but by verification.
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