I do not pretend to know where many ignorant men are sure -- that is all that agnosticism means.

I do not pretend to know where many ignorant men are sure -- that is all that agnosticism means.

The learned man knows that he is ignorant.

The learned man knows that he is ignorant.

I am not ashamed to confess I am ignorant of what I do not know

I am not ashamed to confess I am ignorant of what I do not know

Fear always springs from ignorance

Fear always springs from ignorance

Gross ignorance: 144 times worse than ordinary ignorance.

Gross ignorance: 144 times worse than ordinary ignorance.

Real knowledge is to know the extent of one's ignorance.

Real knowledge is to know the extent of one's 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.

Ignorance is not innocence but sin.

Ignorance is not innocence but sin.

One of the keys to happiness is a bad memory.

One of the keys to happiness is a bad memory.