No one can teach, if by teaching we mean the transmission of knowledge, in any mechanical fashion, from one person to another. The most that can be done is that one person who is more knowledgeable than another can, by asking a series of questions, stimulate the other to think, and so cause him to learn for himself.
SocratesHe is a man of courage who does not run away, but remains at his post and fights against the enemy.
Socrates