-The deepest definition of youth is life as yet untouched by tragedy.
-The secret to happiness lies in knowing this: that we live by the law of expenditure. We find the greatest joy not in getting, but in expressing what we are. There are tides in the ocean of life, and what comes in depends on what goes out. The currents flow inward only where there is an outlet. Nature does not give to those who will not spend: here gifts are merely loaned to those who will not use them. Empty your lungs and breathe, run, climb, work, and laugh: the more you give out, the more you shall receive. Be exhausted and you shall be fed. People do not really live for honors or for pay; their gladness is in not taking and holding, but in doing, the striving, the building, the living. It is a higher joy to teach than to be taught–it is good to get justice, but better to do it–fun to have things, but more fun to make them. The happy person is the one who lives the life of love not for the honors it may bring, but for the life itself.
-I have suffered a great deal from writers who have quoted this or that sentence of mine either out of its context or in juxtaposition to some incongruous matter which quite distorted my meaning , or destroyed it altogether.
-If a dog jumps in your lap, it is because he is fond of you; but if a cat does the same thing, it is because your lap is warmer.
-The vitality of thought is in adventure. Ideas won’t keep. Something must be done about them.
Alfred North Whitehead