Maitrayaniya Upanishad 4.6

4.6

mano hi dvividhaṃ proktaṃ śuddhaṃ cāśuddhameva ca |
aśuddhaṃ kāmasaṅkalpaṃ śuddhaṃ kāmavivarjitam ||

'These are but the chief manifestations of the highest, the immortal, the incorporeal Brahman. He who is devoted to one, rejoices here in his world (presence), thus he said. Brahman indeed is all this, and a man may meditate on, worship, or discard also those which are its chief manifestations. With these (deities) he proceeds to higher and higher worlds, and when all things perish, he becomes one with the Purusha, yes, with the Purusha.'