"Be grateful to everyone" is about making peace with the aspects of ourselves that we have rejected... If we were to make a list of people we don't like - people we find obnoxious, threatening, or worthy of contempt - we would discover much about those aspects of ourselves that we can't face... other people trigger the karma that we haven't worked out.
Pema ChodronTo stay with that shakiness-to stay with a broken heart, with a rumbling stomach, with the feeling of hopelessness and wanting to get revenge-that is the path of true awakening. Sticking with that uncertainty, getting the knack of relaxing in the midst of chaos, learning not to panic-this is the spiritual path.
Pema Chodron