To do something altruistic each day is to ensure happiness.
Expression: When there is the thought to do something altruistic for someone every day, there is the ability to give happiness unconditionally. Whatever the relationship or whatever the personality of the other person, the one who develops the habit of doing this, is able to remain a source of support for those around.
Experience: The best gift I can give is to give happiness and to finish sorrow. When I am constantly thinking of this, not for any reward but just for the sake of it, I am able to discover and enjoy the fruit of that action. I am free from expectations and am able to enjoy the action itself.