"If you are given to avarice, think often of the folly of this sin, which makes us the slave of what was made only to serve us; remember how when we die we must leave all we possess to those who come after us, who may squander it, ruin their own souls b misusing it, [...]
"The principal cause of discontent is egotism, or selfishness, which sets the self up as a primary plant around which everyone else must revolve. The second cause of discontent is envy, which makes us regard the possessions and the talents of others as if they were stolen from us. The third cause is covetousness, [...]
"If you long earnestly, anxiously, and persistently after what you do not possess, it is all very well to say that you do not wish to get it unfairly, but you are all the time guilty of avarice." Source: St. Francis de Sales, Introduction to the Devout Life, Random House, Inc., 2002.