"Lust is to the other passions what the nervous fluid is to life; it supports them all, lends strength to them all ambition, cruelty, avarice, revenge, are all founded on lust"

This quote by Marquis de Sade suggests that desire is the driving force behind much of the other enthusiasms in life. He compares it to the worried fluid, which is essential for life. Without it, the other enthusiasms would not exist. He recommends that aspiration, cruelty, avarice, and revenge are all rooted in desire. This indicates that without lust, these other enthusiasms would not be as strong or as effective. It is the foundation upon which they are developed. This quote suggests that desire is a powerful feeling that can drive people to do things they would not usually do. It is a powerful force that can be utilized for both great and bad. It is necessary to recognize the power of desire and to use it properly.