137 Complete independence of the opposites.
Verses on independence of the opposites come in nearly every chapter. The instruction is first about physical effects: II.14 It is the contacts with material things that cause heat and cold, pleasure and pain; They come and go, impermanent as they are. Do you endure them bravely. Śaṅkara points out that some, such as heat and cold, register on the senses, and these are invariable effects. Other opposites like pleasure and pain are appreciated by mind, and the same thing can have varying mental effects. For instance, a given degree of heat or cold can give pleasure in one situation …