XIII. This may ever be my comfort and security: my understanding, that ruleth over all, will not of itself bring trouble and vexation upon itself. This I say; it will not put itself in any fear, it will not lead itself into any concupiscence. If it be in the power of any other to compel it to fear, or to grieve, it is free for him to use his power. But sure if itself do not of itself, through some false opinion or supposition incline itself to any such disposition; there is no fear. For as for the body, why should I make the grief of my body, to be the grief of my mind? If that itself can either fear or complain, let it. But as for the soul, which indeed, can only be truly sensible of either fear or grief; to which only it belongs according to its different imaginations and opinions, to admit of either of these, or of their contraries; thou mayst look to that thyself, that it suffer nothing. Induce her not to any such opinion or persuasion. The understanding is of itself sufficient unto itself, and needs not (if itself doth not bring itself to need) any other thing besides itself, and by consequent as it needs nothing, so neither can it be troubled or hindered by anything, if itself doth not trouble and hinder itself. XIV. What is εὐδαιμονία, or happiness: but ἀγαθὸς δαίμων, or, a good dæmon, or spirit? What then dost thou do here, O opinion? By the Gods I adjure thee, that thou get thee gone, as thou earnest: for I need thee not. Thou earnest indeed unto me according to thy ancient wonted manner. It is that, that all men have ever been subject unto. That thou camest therefore I am not angry with thee, only begone, now that I have found thee what thou art. XV. Is any man so foolish as to fear change, to which all things that once were not owe their being? And what is it, that is more pleasing and more familiar to the nature of the universe? How couldst thou thyself use thy ordinary hot baths, should not the wood that heateth them first be changed? How couldst thou receive any nourishment from those things that thou hast eaten, if they should not be changed? Can anything else almost (that is useful and profitable) be brought to pass without change? How then dost not thou perceive, that for thee also, by death, to come to change, is a thing of the very same nature, and as necessary for the nature of the universe?