Mortimer Adler

"Aristotle uses a mother's love for her child as the prime example of love or friendship."

"The love which moves the world, according to common Christian belief, is God's love and the love of God."

"Conjugal love, or the friendship of spouses, can persist even after sexual desires have weakened, withered, and disappeared."

"Love can be unselfish, in the sense of being benevolent and generous, without being selfless."

"Friendship is a very taxing and arduous form of leisure activity."