Many philosophers of religion, however, have adopted an analogously broader definition of religion, namely, that of Tillich. He defines religion as "ultimate concern" which he describes as "an abstract translation of the great commandment: `You shall love the Lord your God with all your heart, and with all your soul and with all your mind, and with all your strength.'"
An ultimate concern is unconditional, total, infinite, and transcends all preliminary concerns. "Our ultimate concern is that which determines our being or not-being." Furthermore, "every human being exists in the power of an ultimate concern, whether or not he is fully conscious of it, whether or not he admits it to himself or others." This means that all people have a religion, that which functions in their lives in the same way as the traditional religions, namely, interpreting their experience and ordering and guiding their lives.
It has been objected that Tillich's definition of religion makes everyone into a religious person. Tillich, however, is perfectly aware that many people are not religious in the traditional sense of being adherents of one of the world religions.
So we could continue to define religion in the traditional way. But that would obscure the fact to which Tillich's definition bears witness, namely, that religion or being religious is an essential dimension of human existence. John Dewey makes a similar point when he asserts that there is a religious attitude, outlook, and function, and that "whatever introduces genuine perspective is religious." Moreover, one of the volumes in the World Spirituality series deals with secular spiritualities.