The more precise the measurement of position, the more imprecise the measurement of momentum, and vice versa.
People weighed down with troubles do not look back; they know only too well that misfortune stalks them.
The learned man knows that he is ignorant.
Wisdom is the health of the soul.
I'm religiously opposed to religion.
The human soul has still greater need of the ideal than of the real. It is by the real that we exist; it is by the ideal that we live.
To love another person is to see the face of God.
A revolutionary woman can't have no reactionary man.
I wonder what ants do on rainy days?
Free all the prisoners everywhere, all they want is truth and justice, all they need is love and care.
Prayer cannot be a request made to a theistic deity to act in human history in a particular way.