As to contemplation, it is only when a person is advanced enough that he can contemplate; because contemplation is not on an object, it is on an idea. No doubt a man may think that he is ready to do anything, and that after concentration he can contemplate; but the nature of the mind is such that it slips out of one's hands the moment one tries to hold it. Therefore before one really starts to think the mind has already thrown off the object of concentration like a restive horse.