The rung of a ladder was never meant to rest upon.
It is not who is right, but what is right, that is of importance.
Perhaps the most valuable result of all education is the ability to make yourself do the thing you have to do, when it ought to be done, whether you like it or not. It is the first lesson that ought to be learned and however early a man's training begins, it is probably the last lesson that he learns thoroughly.
Try to learn something about everything and everything about something.
Learn what is true in order to do what is right.
The secret of genius is to carry the spirit of childhood into maturity.
Skepticism is the highest duty and blind faith the one unpardonable sin.
Of the few innocent pleasures left to men past middle life, the jamming of common sense down the throats of fools is perhaps the keenest.
The great tragedy of science - the slaying of a beautiful hypothesis by an ugly fact.
I'd rather have an ape for an ancestor than a bishop.
Every great advance in natural knowledge has involved the absolute rejection of authority.
Make up your mind to act decidedly and take the consequences. No good is ever done in this world by hesitation.
It is far better for a man to go wrong in freedom than to go right in chains.
We live in a world which is full of misery and ignorance, and the plain duty of each and all of us is to try to make the little corner he can influence somewhat less miserable and somewhat less ignorant than it was before he entered.
Science commits suicide when it adopts a creed.
We are prone to see what lies behind our eyes, rather than what apprears before them.
I care not what subject is taught, if only it be taught well.
The chess-board is the world, the pieces are the phenomena of the universe, the rules of the game are what we call the laws of Nature. The player on the other side is hidden from us.
There is no sadder sight in the world than to see a beautiful theory killed by a brutal fact.
The only people, scientific or other, who never make mistakes are those who do nothing.
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.
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.
There is but one right, and the possibilities of wrong are infinite.
To a clear eye the smallest fact is a window through which the infinite may be seen.
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