More quotes by Mortimer Adler

"Friendship is a very taxing and arduous form of leisure activity."
"Love can be unselfish, in the sense of being benevolent and generous, without being selfless."
"Aristotle uses a mother's love for her child as the prime example of love or friendship."
"Conjugal love, or the friendship of spouses, can persist even after sexual desires have weakened, withered, and disappeared."