It takes a great deal of bravery to stand up to our enemies, but just as much to stand up to our friends.
No man has any natural authority over his fellow men.
Thought can be so seductive and hypnotic that it absorbs your attention totally, so you become your thoughts.
One of the truest tests of integrity is its blunt refusal to be compromised.
Colorless green ideas sleep furiously
Destiny is not a passive agent that lies in the lap of the Gods, but is an active instrument that lies in your own hands to shape as you will.
Be curious, not judgmental.
The pendulum of the mind oscillates between sense and nonsense, not between right and wrong.
The more that you read, the more things you will know. The more that you learn, the more places you'll go.
Think globally, act locally.
When you undervalue what you do, the world will undervalue who you are
What's done can't be undone.
If you don't stand for something you will fall for anything.
Good advice is always certain to be ignored, but that's no reason not to give it.
The weak can never forgive. Forgiveness is the attribute of the strong.
Science may set limits to knowledge, but should not set limits to imagination.
I think, therefore I am.
Rational discussion is useful only when there is a significant base of shared assumptions.
To live is not merely to breathe; it is to act; it is to make use of our organs, senses, faculties - of all those parts of ourselves which give us the feeling of existence
Your inner world has its own taste, has its own fragrance, has its own light. And it is utterly silent.
The lie is a condition of life.