Charak Samhita
तदेव भावादग्राह्यं नित्यत्व [१] न कुतश्चन। भावाज्ज्ञेयं तदव्यक्तमचिन्त्यं व्यक्तमन्यथा। ।६०॥
The absolute soul cannot be perceived by anything, for eternity is not caused by anything. So, the absolute soul is unmanifested and imperceptible. The manifested creation is, of course, otherwise.
english translation
tadeva bhAvAdagrAhyaM nityatva [1] na kutazcana। bhAvAjjJeyaM tadavyaktamacintyaM vyaktamanyathA। ।60॥
hk transliteration by Sanscript