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.

The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.

Where there is shouting, there is no true knowledge.

Death may be the greatest of all human blessings.

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

An honest man is always a child.

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