The Upanishads are Manichaeans?

"Sir, in this ill-smelling, unsubstantial body, which a conglomerate of bone, skin, muscle, marrow, flesh, semen, blood, mucus, tears, rheum, feces, urine, wind, bile, and phlegm, what is the of enjoyment of desire? In this body, which is afflicted with desire, anger, covetousness, delusion, fear, despondancy, envy, separation from the deseirable, union with the undesirable, hunger, thirst, senility, death, disease, sorrow and the like, what is the good of enjoyment of desires? And we see that this whole world is decaying like these gnats, these mosquitos, this grass, and these trees that arise and perish.

Maitri Upanishad