1. Four principles of four kinds of people

    A saintly person can tolerate all kinds of miserable conditions of life, a learned man can discharge his duties without awaiting favorable circumstances, a heinous person like Kamsa can act in any sinful way, and a devotee can sacrifice everything to satisfy the Supreme Personality of Godhead.

    From Srila Prabhupada's Krsna Book, Ch. 1: The Advent of Lord Krsna