Everything desires not like but unlike: for example, the dry desires the moist, the cold the hot, the bitter the sweet, the sharp the blunt, the void the full, the full the void, and so of all other things; for the opposite is the food of the opposite, whereas like receives like receives nothing from like.
Mind is dual, it always divides things into polar opposites: the conqueror and the conquered, the observer and the observed, the object and the subject, the day and the night. It goes on dividing things which are not divided. Neither is the day divided from the night, nor is birth divided from death. They are one energy. But mind goes on dividing everything into polarities, opposites. Nothing is opposite in existence; every contradiction is only apparent. Deep down all contradictions are meeting together.
But nirvana is a radical transformation of how it feels to be alive: it feels as if everything were myself, or as if everything---including "my" thoughts and actions---were happening of itself. There are still efforts, choices, and decisions, but not the sense that "I make them"; they arise of themselves in relation to circumstances. This is therefore to feel life, not as an encounter between subject and object, but as a polarized field where the contest of opposites has become the play of opposites.
Rhetoric is useful because the true and the just are naturally superior to their opposites, so that, if decisions are improperly made, they must owe their defeat to their own advocates; which is reprehensible. Further, in dealing with certain persons, even if we possessed the most accurate scientific knowledge, we should not find it easy to persuade them by the employment of such knowledge. For scientific discourse is concerned with instruction, but in the case of such persons instruction is impossible.