The height of ability in the least able consists in knowing how to submit to the good leadership of others.

There is great ability in knowing how to conceal one’s ability.

It is a great ability to be able to conceal one's ability.

To know how to hide one's ability is great skill.

Nothing is impossible; there are ways that lead to everything, and if we had sufficient will we should always have sufficient means. It is often merely for an excuse that we say things are impossible.

No man is clever enough to know all the evil he does.