The nature of thoughts, desires and impulses

Q: May I know the nature of thoughts, desires and impulses? How and why do they come into men?

This is a thing one feels: one cannot say more than what everybody knows. As for how these come, they come as movements of universal Nature, taking form in the person if they are admitted, just as other natural forces move about in waves or currents and take form or act for particular purposes in a suitable receptacle.

– Sri Aurobindo