God created man in his own image and likeness: calling him to existence through love, he called him at the same time for love. God is love and in himself he lives a mystery of personal loving communion. Creating the human race in his own image and continually keeping it in being, God inscribed in the humanity of man and woman the vocation, and thus the capacity and responsibility, of love and communion. Love is therefore the fundamental and innate vocation of every human being.
-St. John Paul II, Familiaris Consortio