The things you think about determine the quality of your mind. Your soul takes on the color of your thoughts.
Most of what we say and do is not necessary, and its omission would save both time and trouble. At every step, therefore, a man should ask himself, 'Is this one of the things that are superfluous?' Moreover, not idle actions only but even idle impressions ought to be suppressed; for the unnecessary action will not ensue.
The logos gave you the means to see it—that a given person would act a given way—but you paid no attention. And now you're astonished that he's gone and done it. So when you call someone untrustworthy or ungrateful, turn the reproach on yourself. It was you who did wrong.
This thou must always bear in mind, what is the nature of the whole, and what is my nature, and how this is related to that, and what kind of a part it is of what kind of a whole; and that there is no one who hinders thee from always doing and saying the things which are according to the nature of which thou art a part.
You have sent a letter to me through the hand of a "friend" of yours, as you call him. And in your very next sentence you warn me not to discuss with him all the matters that concern you, saying that even you yourself are not accustomed to do this; in other words, you have in the same letter affirmed and denied that he is your friend.