| A mind that is stretched by a new experience can never go back to its old dimensions.
| Truth is tough. It will not break, like a bubble, at the touch, nay, you may kick it about all day like a football, and it will be round and full at evening.
| Young man, the secret of my success is that an early age I discovered that I was not God.
| I despise making the most of one's time. Half of the pleasures of life consist of the opportunities one has neglected.
| The rule of joy and the law of duty seem to me all one.
| We should be eternally vigilant against attempts to check the expression of opinions that we loathe.
| Certitude is not the test of certainty. We have been cocksure of many things that were not so.
| Every event that a man would master must be mounted on the run, and no man ever caught the reins of a thought except as it galloped past him.
| Lawyers spend a great deal of their time shoveling smoke.
| A child's education should begin at least one hundred years before he is born.
| The greatest act of faith is when a man understands he is not God.
| To be seventy years young is sometimes for more cheerful and hopeful than to be forty years old.
| Man's mind, stretched by a new idea, never goes back to its original dimensions.
| Life is an end in itself, and the only question as to whether it is worth living is whether you have had enough of it.
| The greatest thing in this world is not so much where we are, but in what direction we are moving.
| Any two philosophers can tell each other all they know in two hours.
| To have doubted one's own first principles is the mark of a civilized man.
| Nothing is so commonplace has the wish to be remarkable.
| It seems to me that at this time we need education in the obvious more than the investigation of the obscure.
| A moment's insight is sometimes worth a life's experience.