One of the keys to happiness is a bad memory.

One of the keys to happiness is a bad memory.

A person is never happy except at the price of some ignorance.

A person is never happy except at the price of some ignorance.

Nothing in the world is more dangerous than a sincere ignorance and conscientious stupidity.

Nothing in the world is more dangerous than a sincere ignorance and conscientious stupidity.

There is no darkness but ignorance.

There is no darkness but ignorance.

Nothing in all the world is more dangerous than sincere ignorance and conscientious stupidity.

Nothing in all the world is more dangerous than sincere ignorance and conscientious stupidity.

Ignorance is not innocence but sin.

Ignorance is not innocence but sin.

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.

There is no reply to the ignorant like keeping silence

There is no reply to the ignorant like keeping silence

The greatest ignorance is to reject something you know nothing about

The greatest ignorance is to reject something you know nothing about