Spiritual advancement is the purpose of our lives. We are to rejoin Christ, who is now the entire body of Christ. To this union with God, we bring our unique and hard-earned virtues...God who cannot gain in virtue has found a way to do just this. Fifteen chapters detail the problems of selfishness and sin, moral and theological virtues, the traditional three stages of spiritual advancement: purgative, illuminative, unitive; the necessity of the dark night of the soul and its four stages. Unique to this book are chapters on how spiritual advancement might have proceeded in the absence of original sin, and possible future events in spiritual advancement.