The line 1.16 of Yoga Sutras refers to the category of “gunas”, thus in order to understand this line we need first to study out the meaning of this category, so let us proceed to this.
Normally each one who is somehow related to yoga even in its most “pop” variants has heard the terms that denote each of the three gunas – sattva, rajas and tamas. However the paradox here is that though using these terms in various applied aspects – starting from “Vedic” culinary art and up to Hatha-yoga – the majority of people don’t make any attempt to understand the definition: WHAT are the gunas in their general meaning. Moreover, they are not only pseudo-esoterics who are far from this understanding, but the experts in Indian culture and philosophy as well. It seems like everyone has so much got used to the category that they have all ceased “losing their sleep” over its core point. In most cases they introduce the three gunas through “pure Vishuddha”, i.e. by means of different metaphors. For instance, the Krishnaites prefer emotional metaphors: sattva is the loftiness and nobleness, rajas is the passion while tamas is the ignorance; the followers of Ayurveda are prone to describing it in physiological manner, for instance tamas is the sleepiness. Even the Indology experts use the metaphors, though their metaphors come close to notions of humanities. For instance, Max Mueller, the outstanding scientist, has correlated the three gunas with Hegel’s triad thesis-antithesis-synthesis.
