"Nature, who for the perfect maintenance of the laws of her general equilibrium, has sometimes need of vices and sometimes of virtues, inspires now this impulse, now that one, in accordance with what she requires"

This quote by Marquis de Sade talks to the concept that nature remains in a continuous state of balance, and that in order to preserve this balance, it needs both vices and virtues. Nature is viewed as a force that has the ability to influence various impulses in order to attain its desired equilibrium. This suggests that nature is in control of the balance in between great and bad, and that it is able to control the actions of individuals in order to accomplish its preferred outcome. This quote suggests that nature is a powerful force that is able to affect the habits of people in order to keep its balance. It likewise suggests that nature has the ability to use both vices and virtues to accomplish its wanted outcome, which it is ultimately in control of the balance between excellent and bad.