Happiness is never decreased by being shared. Our antagonist is our helper. We are caught in an inescapable network of mutuality, tied in a single garment of destiny. Whatever affects one directly, affects all indirectly. Some need it far more.
Any fool can know.
The point is to understand. Our deeds determine us as much as we determine our deeds. The eyes of the cheerful and of the melancholy man are fixed upon the same creation, but very different are the aspects which it bears to them. The road to your life's work is the ongoing process of taking the best of what's in you and expressing it fully to the outer world. There is no rule more invariable than that we are paid for our suspicions by finding that withch we suspect.