Moderation in temper is always a virtue; but moderation in principle is always a vice.
Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth.
The only limit to our realization of tomorrow will be our doubts of today.
Don't criticize what you don't understand, son. You never walked in that man's shoes.
Thought can be so seductive and hypnotic that it absorbs your attention totally, so you become your thoughts.
You laugh at me because I'm different, I laugh at you because you're all the same.
Wisdom... comes not from age, but from education and learning.
Never argue with an idiot. They drag you down to their level and then beat you with experience.
Judge a man by his questions rather than by his answers.
Energy may be likened to the bending of a crossbow; decision,to the releasing of a trigger.
Everybody is ignorant, only on different subjects.
The lie is a condition of life.
Stubborn and ardent clinging to one's opinion is the best proof of stupidity.
And no one will listen to us until we listen to ourselves.
Words mean more than what is set down on paper. It takes the human voice to infuse them with deeper meaning.
The noblest pleasure is the joy of understanding.
Yesterday I was clever, so I wanted to change the world. Today I am wise, so I am changing myself.
A scholar who cherishes the love of comfort is not fit to be deemed a scholar.
Rational discussion is useful only when there is a significant base of shared assumptions.
Knowing yourself is the beginning of all wisdom.
Creativity is the process of having original ideas that have value.