Hear, then, I said, my own dream; whether coming through the horn or the ivory gate, I cannot tell. The dream is this: Let us suppose that wisdom is such as we are now defining, and that she has absolute sway over us; then each action will be done according to the arts or sciences, and no one professing to be a pilot when he is not, or any physician or general, or any one else pretending to know matters of which he is ignorant, will deceive or elude us; our health will be improved; our safety at sea, and also in battle, will be assured; our coats and shoes, and all other instruments and implements will be skilfully made, because the workmen will be good and true. Aye, and if you please, you may suppose that prophecy, which is the knowledge of the future, will be under the control of wisdom, and that she will deter deceivers and set up the true prophets in their place as the revealers of the future. Now I quite agree that mankind, thus provided, would live and act according to knowledge, for wisdom would watch and prevent ignorance from intruding on us. But whether by acting according to knowledge we shall act well and be happy, my dear Critias,--this is a point which we have not yet been able to determine. Yet I think, he replied, that if you discard knowledge, you will hardly find the crown of happiness in anything else. But of what is this knowledge? I said. Just answer me that small question. Do you mean a knowledge of shoemaking? God forbid. Or of working in brass? Certainly not. Or in wool, or wood, or anything of that sort? No, I do not. Then, I said, we are giving up the doctrine that he who lives according to knowledge is happy, for these live according to knowledge, and yet they are not allowed by you to be happy; but I think that you mean to confine happiness to particular individuals who live according to knowledge, such for example as the prophet, who, as I was saying, knows the future. Is it of him you are speaking or of some one else? Yes, I mean him, but there are others as well. Yes, I said, some one who knows the past and present as well as the future, and is ignorant of nothing. Let us suppose that there is such a person, and if there is, you will allow that he is the most knowing of all living men. Certainly he is. Yet I should like to know one thing more: which of the different kinds of knowledge makes him happy? or do all equally make him happy? Not all equally, he replied. But which most tends to make him happy? the knowledge of what past, present, or future thing? May I infer this to be the knowledge of the game of draughts? Nonsense about the game of draughts. Or of computation? No. Or of health? That is nearer the truth, he said. And that knowledge which is nearest of all, I said, is the knowledge of what? The knowledge with which he discerns good and evil.