Learn what is true in order to do what is right.
Try to learn something about everything and everything about something.
I am content with nothing, restless and ambitious... and I despise myself for the vanity, which formed half the stimulus to my exertions. Oh would that I were one of those plodding wise fools who having once set their hand to the plough go on nothing doubting.
Freedom and order are not incompatible... truth is strength... free discussion is the very life of truth.
The great thing in the world is not so much to seek happiness as to earn peace and self-respect.
It is one of the most saddening things in life that, try as we may, we can never be certain of making people happy, whereas we can almost always be certain of making them unhappy.
It is not who is right, but what is right, that is of importance.
The known is finite, the unknown infinite; intellectually we stand on an islet in the midst of an illimitable ocean of inexplicability. Our business in every generation is to reclaim a little more land, to add something to the extent and the solidity of our possessions.
The world is neither wise nor just, but it makes up for all its folly and injustice by being damnably sentimental.
The most considerable difference I note among men is not in their readiness to fall into error, but in their readiness to acknowledge these inevitable lapses.
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.
Science is organized common sense where many a beautiful theory was killed by an ugly fact.
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.
The great tragedy of science - the slaying of a beautiful hypothesis by an ugly fact.
The ultimate court of appeal is observation and experiment... not authority.
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