How hard it is to project oneself into the future. We are always prone to think of the conditions which are with us today as being permanent conditions.

Choose a challenge instead of competence

Someone once asked me what I regarded as the three most important requirements for happiness. My answer was: A feeling that you have been honest with yourself and those around you; a feeling that you have done the best you could both in your personal life and in your work; and the ability to love others.

those who attack always do so with greater fervor than those who defend.

practically nothing we do ever stands by itself. If it is good, it will serve some good purpose in the future. If it is evil, it may haunt us and handicap our efforts in unimagined ways.

The most unhappy people in the world are those who face the days without knowing what to do with their time. But if you have more projects than you have time for, you are not going to be an unhappy person. This is as much a question of having imagination and curiosity as it is of actually making plans.

Anyone who thinks must think of the next war as they would of suicide.