We are selfish when we are exclusively or predominantly concerned with the good for ourselves. We are altruistic when we are exclusively or predominantly concerned with the good of others.
Mortimer AdlerThe materialist assumption that spiritual substances do not exist is as much an act of faith as the religious belief in the reality of angels.
Mortimer AdlerSin is not only manifested in certain acts that are forbidden by divine command. Sin also appears in attitudes and dispositions and feelings. Lust and hate are sins as well as adultery and murder. And, in the traditional Christian view, despair and chronic boredom - unaccompanied by any vicious act - are serious sins. They are expressions of man's separation from God, as the ultimate good, meaning, and end of human existence.
Mortimer Adler