Ignorance breeds monsters to fill up the vacancies of the soul that are unoccupied by the verities of knowledge.

But let a man know that there are things to be known, of which he is ignorant, and it is so much carved out of his domain of universal knowledge.

There is nothing so costly as ignorance.

On entering this world our starting-point is ignorance. None, however, but idiots remain there.

Ignorance has been well represented under the similitude of a dungeon, where, though it is full of life, yet darkness and silence reign. But in society the bars and locks have been broken; the dungeon itself is demolished; the prisoners are out; they are in the midst of us. We have no security but to teach and renovate them.