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.

Summary

This quote suggests that lust is like a vital energy that sustains and strengthens other intense emotions and desires. It compares lust to the nervous fluid that is essential for life. It argues that various passionate feelings such as ambition, cruelty, avarice, and revenge all have lust as their fundamental basis or foundation. In essence, it implies that lust plays a significant role in driving and supporting these intense passions and their subsequent actions.