The secret of change is to focus all of your energy, not on fighting the old, but on building the new.

The only true wisdom is in knowing you know nothing.

Be as you wish to seem.

Ignorance, the root and stem of all evil.

Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.

My brain is only a receiver, in the Universe there is a core from which we obtain knowledge, strength and inspiration. I have not penetrated into the secrets of this core, but I know that it exists.

Death may be the greatest of all human blessings.

The most important knowledge is that which guides the way you lead your life.

I cannot teach anybody anything. I can only make them think.