Mistakes are often the best teachers.

Sacrifice is the first element of religion, and resolves itself in theological language into the love of God.

Ignorance is the dominion of absurdity.

Of all the evil spirits abroad at this hour in the world, insincerity is the most dangerous.

Instruction does not prevent wasted time or mistakes; and mistakes themselves are often the best teachers of all.

Every one of us ... knows better than he practices, and recognizes a better law than he obeys.

Experience teaches slowly, and at the cost of mistakes.