Three Philosophies of Life: Ecclesiastes, Job, and Song of Songs

I've been a philosopher for all my adult life and the three most profound books of philosophy that I have ever read are Ecclesiastes, Job, and Song of Songs." These are the opening lines of Kreeft's Three Philosophies of Life. He reflects that there are ultimately only three philosophies of life and each one is represented by one of these books of the Bible-life is vanity; life is suffering; life is love.