All things that can be perceived by the sense are designated Manifest. One should seek to know all, however, that is Unmanifest, that is beyond the perception of the senses, that can be ascertained only by the subtile senses.
इन्द्रियैर्गृह्यते यद् यत् तत्तद् व्यक्तमिति स्थितिः। अव्यक्तमिति विज्ञेयं लिङ्गग्राह्यमतीन्द्रियम्॥