What is the theme in The World's Wisdom: Sacred Texts of the World's Religions by Philip Novak?

Despite the cultures in which the seven major religions and the 100,000 primal religions were created and evolved there are similarities among all the religions. There is normally and inspired leader who is intelligent and curious about creation and spirituality. In most cases, the leader is willing to sacrifice himself and in some cases, his riches, in order to seek the truth.