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Knowledge becomes evil if the aim be not virtuous.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge.

Ignorance of all things is an evil neither terrible nor excessive, nor yet the greatest of all; but great cleverness and much learning, if they be accompanied by a bad training, are a much greater misfortune.

The evil that is in the world almost always comes of ignorance, and good intentions may do as much harm as malevolence if they lack understanding.

Ignorance can be improved; willful ignorance and inaction is inexcusable.

Suppose that we are wise enough to learn and know - and yet not wise enough to control our learning and knowledge, so that we use it to destroy ourselves? Even if that is so, knowledge remains better than ignorance.

The only good is knowledge, and the only evil is ignorance.

They that know no evil will suspect none.

It is harder to conceal ignorance than to acquire knowledge.