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" Learn what is true in order to do what is right. "

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" All truth, in the long run, is only common sense clarified. "

" Make up your mind to act decidedly and take the consequences. No good is ever done in this world by hesitation. "

" 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 struggle for existence holds as much in the intellectual as in the physical world. A theory is a species of thinking, and its right to exist is coextensive with its power of resisting extinction by its rivals. "

" The great thing in the world is not so much to seek happiness as to earn peace and self-respect. "

" 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. "

" I took thought, and invented what I conceived to be the appropriate title of 'agnostic'. "

" Logical consequences are the scarecrows of fools and the beacons of wise men. "

" I do not say think as I think, but think in my way. Fear no shadows, least of all in that great spectre of personal unhappiness which binds half the world to orthodoxy. "

" Every great advance in natural knowledge has involved the absolute rejection of authority. "

" 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. "

" It is not who is right, but what is right, that is of importance. "

" There is no sea more dangerous than the ocean of practical politics none in which there is more need of good pilotage and of a single, unfaltering purpose when the waves rise high. "

" Nothing can be more incorrect than the assumption one sometimes meets with, that physics has one method, chemistry another, and biology a third. "

" 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 world is neither wise nor just, but it makes up for all its folly and injustice by being damnably sentimental. "

" Science is simply common sense at its best, that is, rigidly accurate in observation, and merciless to fallacy in logic. "

" Patience and tenacity are worth more than twice their weight of cleverness. "

" There is but one right, and the possibilities of wrong are infinite. "

" No slavery can be abolished without a double emancipation, and the master will benefit by freedom more than the freed-man. "

" The great tragedy of science - the slaying of a beautiful hypothesis by an ugly fact. "

" Try to learn something about everything and everything about something. "

" 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 man of science has learned to believe in justification, not by faith, but by verification. "