If knowledge can create problems, it is not through ignorance that we can solve them.

We cannot face today's challenge with yesterday's knowledge.

Nothing ... will ever be attempted, if all possible objections must be first overcome.

Nothing [...] will ever be attempted, if all possible objections must be first overcome.

We cannot change what we are unaware of, and once we are aware, we cannot help but change.

If we are caught by the obstacle of knowledge, even if truth comes knocking at our door, we will refuse to let it in.

There are two things which cannot be attacked in front: ignorance and narrow-mindedness. They can only be shaken by the simple development of the contrary qualities. They will not bear discussion.

Ignorance can’t be pardoned. Only cured.

We cannot allow quibbles to stand in the way of the truth.

We cannot change what we are not aware of, and once we are aware, we cannot help but change.

no people can be both ignorant and free.

Where ignorance is our master, there is no possibility of real peace.

Our knowledge can only be finite, while our ignorance must necessarily be infinite.

Action cannot destroy ignorance, for it is not in conflict with or opposed to ignorance. Knowledge does verily destroy ignorance as light destroys deep darkness.