That our opinion gives value to things is seen by many things that we do not think about even to appraise them, preferring to think about ourselves instead. We consider neither their qualities nor their uses, but only the cost to us of getting them, as if it were some part of their substance; and we call value in them not what they bring, but what we bring to them. At which point I note that we are great economizers of our expenditure. According as it weights, it serves by the fact that it weighs. Our opinion never lets it run at a false valuation. Purchase gives value to the diamond, and difficulty to virtue, and pain to piety, and harshness to medicine.
Montaigne then concludes his point by examining should be a positive, wealth. Ironically, he explains, just as pain does not always lead to suffering, wealth does not always lead to pleasure. Or as he writes, "In truth, it is not want, but rather abundance, that breeds avarice." Or as Paul writes in his letter to Timothy, "For the love of money is a root of all kinds of evil. Some people, eager for money, have wandered from the faith and pierced themselves with many griefs." 1 Tim. 6:10. Or as Jesus told his disciples after the rich man could not give up his wealth, “Children, how hard it is to enter the kingdom of God! It is easier for a camel to go through the eye of a needle than for someone who is rich to enter the kingdom of God.”
Or, as Robert Reich explains in this video, greed is killing the American economy.