A man's worst difficulties begin when he is able to do as he likes.
It is the first duty of a hypothesis to be intelligible.
Science seems to me to teach in the highest and strongest manner the great truth which is embodied in the Christian conception of entire surrender to the will of God. Sit down before fact as a little child, be prepared to give up every preconceived notion, follow humbly wherever and to whatever abysses nature leads, or you shall learn nothing. I have only begun to learn content and peace of mind since I have resolved at all risks to do this.
If individuality has no play, society does not advance; if individuality breaks out of all bounds, society perishes.
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.
Follow humbly wherever and to whatever abyss Nature leads, or you shall learn nothing.
The supernatural is being swept out of the universe in the flood of new knowledge of what is natural. It will soon be as impossible for an intelligent, educated man or woman to believe in a god as it is now to believe that earth is flat, that flies can be spontaneously generated, that disease is a divine punishment, or that death is always due to witchcraft.
Time, whose tooth gnaws away everything else, is powerless against truth.
If there is anything in the world which I do firmly believe in, it is the universal validity of the law of causation.
No slavery can be abolished without a double emancipation, and the master will benefit by freedom more than the freed-man.
Action is the catalyst that creates accomplishments. It is the path that takes us from uncrafted hopes to realized dreams.
The child who has been taught to make an accurate elevation, plan, and section of a pint pot has had an admirable training in accuracy of eye and hand.
People may talk about intellectual teaching, but what we principally want is the moral teaching.
To persons uninstructed in natural history, their country or seaside stroll is a walk through a gallery filled with wonderful works of art, nine-tenths of which have their faces turned to the wall.
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.
God give me strength to face a fact though it slay me.
Economy does not lie in sparing money, but in spending it wisely.
The great end of life is not knowledge but action.
'Infidel' is a term of reproach, which Christians and Mohammedans, in their modesty, agree to apply to those who differ from them.
Logical consequences are the scarecrows of fools and the beacons of wise men.
A drop of water is as powerful as a thunder-bolt.
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.
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.
Not far from the invention of fire we must rank the invention of doubt.
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