You must believe in the possibility of happiness in order to be happy. Take from a person who follows the divine law everything which other people think of as comfort and wealth, and nevertheless such a person will remain happy. A person who has spoiled his stomach will criticize his meals saying that the food is bad; the same thing happens with people who are not satisfied with their lives in this world. We do not have the right to be unhappy with our life. If it seems to us that we are not satisfied with life, we should see this as a reason to be unsatisfied with ourselves.