"The tears of the world are a constant quantity. For every one who begins to weep, somewhere else another stops. The same is true of the laughter."

"The philosophy which is so important in each of us is not a technical matter; it is our more or less dumb sense of what life honestly and deeply means."

"The practical value of a truth is its truth."

"If you want a quality, act as if you already had it."

"The more original a discoverer, the more he is apt to be regarded as a lunatic at first."