This opposite thinking creates opposite worlds within each one of us and our ignorance makes us hold on to these opposite worlds. These opposite worlds are ways in conflict with each other, so there is tension and suffering. The Buddha taught how to go from opposite worlds to absolute world.
Absolute world means the world before thinking.
Descartes did not explore this question but Buddhism has always talked about before-thinking. When there are no opposites, it is nirvana. So going from opposite worlds to absolute world is to move into the nirvana world. This is the teaching of Hinayana Buddhism. Mahayana Buddhism begins at the point of emptiness, the absence of self-nature of things.