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It is fairly easy to grasp abstract moral principles; it can be very difficult to apply them to a given situation, particularly when it involves the moral character of another person.

Ayn Rand (1988). “The Ayn Rand Lexicon: Objectivism from A to Z”, p.319, Penguin
It is fairly easy to grasp abstract moral principles; it can be very difficult to apply them to a given situation, particularly when it involves the moral character of another person.