Giving "of" yourself :)
Aristotle, the Greek Philosopher, observed that all human beings wish to be happy and search for happiness.

The Four Levels of Happiness
(Giving of yourself is 3rd level happiness)

Beatitudo: (Beatitudo = happiness or blessedness). The happiness that comes from seeing the good in others and doing the good for others. It is, in essence, other-regarding action. Happiness #3 is, in some sense, at war with happiness #2. One cannot be at the same time in competition with someone else and doing the good for and seeing the good in them. Most people would prefer a world (community, family, relationships) structured around the pursuit of happiness #3 than entirely based in happiness #2. Happiness #3 is higher than happiness #2. The problem with #3 is that it is necessarily limited. We cannot be someone else's everything. For example, we or they, will die and if our happiness is contingent upon them, it dies with them. "There must be more than this."