I am the centre of my universe, the centre of the universe, and in my supreme anguish I cry with Michelet, “Mon moi, ils m’arrachent mon moi!” What is a man profited if he shall gain the whole world and lose his own soul? (Matt. xvi. 26). Egoism, you say? There is nothing more universal than the individual, for what is the property of each is the property of all. Each man is worth more than the whole of humanity, nor will it do to sacrifice each to all save in so far as all sacrifice themselves to each. That which we call egoism is the principle of psychic gravity, the necessary postulate. “Love thy neighbour as thyself,” we are told, the presupposition being that each man loves himself; and it is not said “Love thyself.” And, nevertheless, we do not know how to love ourselves.
Source: Miguel de Unamuno’s The Tragic Sense of Life (1913), Chapter 3. A Project Gutenberg version is online here.