Acharya Prashant explains that the term 'Vritti' refers to a circular pattern that has no beginning or end, representing a closed boundary that defines an individual's limitations. He describes thoughts as numerous and varied, but notes that they can be categorized into a few specific groups such as anger, desire, fear, insecurity, and greed. These categories are the 'Vrittis', and at the root of all these tendencies lies the fundamental 'Vritti' of the 'I'—the ego. He argues that it is a mistake to try to change thoughts without addressing the underlying tendencies, or to change tendencies without addressing the ego.