Mishneh Torah/The Book of Wisdom/Laws of Human Dispositions/Chapter One
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(1) Every single person has many dispositions, and each individual is both different and very distant from any other: A person may have a violent temper, always angry; but another's mind is at ease and he is never angry, or if he does feel anger it is a soft anger once in several years. A person may be very haughty, but another has a very humble disposition. A person may have very strong desires, never satisfied; but another may have a very pure body, not even desiring those few things that the body requires.
A person may be very greedy, not satisfied by all the wealth in the world, as it says, "A lover of silver never has his fill of silver" (Ecclesiastes 5:9). But another may have modest desires, and is satisfied with the smallest thing even if it is not truly enough for him, and he will not exert himself to acquire what he needs.