That (Brahman) is not manifest, for (so the scripture) says

If Brahman exists, then why is It not perceived? The Sruti says that Brahman is unmanifest on account of our being covered with ignorance. Therefore It is not perceived by us: “He is not apprehended by the eye, nor by the other senses, nor by penance” etc. (Mu. 3. 1. 8). Then how? “Some wise man, however, with his eyes turned inside and wishing for immortality saw the Self within” (Kath. 2.4.1);