If everyone feels well, I will also feel well. Otherwise something unexpected can happen at any given moment, and no one has a sense of confidence or safety.
The world has become very close-knit, threatening, and hostile, and it is only possible to achieve happiness under the condition that we unite; this is called joy from good deeds or acts of bestowal. If I am sure that I am providing fulfillment to other people, then they have an egoistic interest in me. I am a source of their fulfillment, and this gives me a sense of confidence that I will be all right; I will be filled myself, and I will fill others.
From the show “Kabbalah For Beginners” 10.28.2010 “Happiness”