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 AureliusThings themselves cannot touch the soul, not in the least degree, nor have they admission to the soul nor can they turn or move the soul: it turns and moves itself alone and whatever judgment it may think proper to make, such it makes by remaking for itself the things that present themselves to it
Marcus Aurelius