XV. To live happily is an inward power of the soul, when she is affected with indifferency, towards those things that are by their nature indifferent. To be thus affected she must consider all worldly objects both divided and whole: remembering withal that no object can of itself beget any opinion in us, neither can come to us, but stands without still and quiet; but that we ourselves beget, and as it were print in ourselves opinions concerning them. Now it is in our power, not to print them; and if they creep in and lurk in some corner, it is in our power to wipe them off. Remembering moreover, that this care and circumspection of thine, is to continue but for a while, and then thy life will be at an end. And what should hinder, but that thou mayest do well with all these things? For if they be according to nature, rejoice in them, and let them be pleasing and acceptable unto thee. But if they be against nature, seek thou that which is according to thine own nature, and whether it be for thy credit or no, use all possible speed for the attainment of it: for no man ought to be blamed, for seeking his own good and happiness. XVI. Of everything thou must consider from whence it came, of what things it doth consist, and into what it will be changed: what will be the nature of it, or what it will be like unto when it is changed; and that it can suffer no hurt by this change. And as for other men's either foolishness or wickedness, that it may not trouble and grieve thee; first generally thus; What reference have I unto these? and that we are all born for one another's good: then more particularly after another consideration; as a ram is first in a flock of sheep, and a bull in a herd of cattle, so am I born to rule over them. Begin yet higher, even from this: if atoms be not the beginning of all things, than which to believe nothing can be more absurd, then must we needs grant that there is a nature, that doth govern the universe. If such a nature, then are all worse things made for the better's sake; and all better for one another's sake. Secondly, what manner of men they be, at board, and upon their beds, and so forth. But above all things, how they are forced by their opinions that they hold, to do what they do; and even those things that they do, with what pride and self-conceit they do them. Thirdly, that if they do these things rightly, thou hast no reason to be grieved. But if not rightly, it must needs be that they do them against their wills, and through mere ignorance. For as, according to Plato's opinion, no soul doth willingly err, so by consequent neither doth it anything otherwise than it ought, but against her will. Therefore are they grieved, whensoever they hear themselves charged, either of injustice, or unconscionableness, or covetousness, or in general, of any injurious kind of dealing towards their neighbours. Fourthly, that thou thyself doest transgress in many things, and art even such another as they are.