When you are annoyed at someone's mistake, immediately look at yourself and reflect how you also fail; for example, in thinking that good equals money, or pleasure, or a bit of fame. By being mindful of this you'll quickly forget your anger, especially if you realize that the person was under stress, and could do little else. And, if you can, find a way to alleviate that stress.
Marcus AureliusIf you separate from . . . everything you have done in the past, everything that disturbs you about the future . . . and apply yourself to living the life that you are living-that is to say, the present-you can live all the time that remains to you until your death in calm, benevolence, and serenity.
Marcus Aurelius