Of course, we must begin with what is known; but then this is of two kinds, what we _do_ know, and what we _may_ know:[5] perhaps then as individuals we must begin with what we _do_ know. Hence the necessity that he should have been well trained in habits, who is to study, with any tolerable chance of profit, the principles of nobleness and justice and moral philosophy generally. For a principle is a matter of fact, and if the fact is sufficiently clear to a man there will be no need in addition of the reason for the fact. And he that has been thus trained either has principles already, or can receive them easily: as for him who neither has nor can receive them, let him hear his sentence from Hesiod: He is best of all who of himself conceiveth all things; Good again is he too who can adopt a good suggestion; But whoso neither of himself conceiveth nor hearing from another Layeth it to heart;—he is a useless man. Chapter III. But to return from this digression. Now of the Chief Good (_i.e._ of Happiness) men seem to form their notions from the different modes of life, as we might naturally expect: the many and most low conceive it to be pleasure, and hence they are content with the life of sensual enjoyment. For there are three lines of life which stand out prominently to view: that just mentioned, and the life in society, and, thirdly, the life of contemplation. Now the many are plainly quite slavish, choosing a life like that of brute animals: yet they obtain some consideration, because many of the great share the tastes of Sardanapalus. The refined and active again conceive it to be honour: for this may be said to be the end of the life in society: yet it is plainly too superficial for the object of our search, because it is thought to rest with those who pay rather than with him who receives it, whereas the Chief Good we feel instinctively must be something which is our own, and not easily to be taken from us. And besides, men seem to pursue honour, that they may believe themselves to be good:[6] for instance, they seek to be honoured by the wise, and by those among whom they are known, and for virtue: clearly then, in the opinion at least of these men, virtue is higher than honour. In truth, one would be much more inclined to think this to be the end of the life in society; yet this itself is plainly not sufficiently final: for it is conceived possible, that a man possessed of virtue might sleep or be inactive all through his life, or, as a third case, suffer the greatest evils and misfortunes: and the man who should live thus no one would call happy, except for mere disputation’s sake.[7] And for these let thus much suffice, for they have been treated of at sufficient length in my Encyclia.[8] A third line of life is that of contemplation, concerning which we shall make our examination in the following pages.[9]