One of the keys to happiness is a bad memory.

One of the keys to happiness is a bad memory.

There is nothing more frightful than ignorance in action.

There is nothing more frightful than ignorance in action.

There is only one evil: ignorance.

There is only one evil: ignorance.

The doorstep to the temple of wisdom is a knowledge of our own ignorance.

The doorstep to the temple of wisdom is a knowledge of our own ignorance.

He must be very ignorant for he answers every question he is asked

He must be very ignorant for he answers every question he is asked

I have never met a man so ignorant that I couldn't learn something from him.

I have never met a man so ignorant that I couldn't learn something from him.

The only thing more expensive than education is ignorance.

The only thing more expensive than education is ignorance.

There is only one good, knowledge, and one evil, ignorance

There is only one good, knowledge, and one evil, ignorance

By ignorance we mistake, and by mistakes we learn

By ignorance we mistake, and by mistakes we learn