अन्यदेव तद्विदितादथो अविदितादधि ।इति शुश्रुम पूर्वेषां ये नस्तद्व्याचचक्षिरे ॥ ४ ॥
In plain words
It is other than the known, and beyond the unknown as well. Thus have we heard from the teachers of old who explained That to us.
Kena · Khaṇḍa 1 · The Light Behind Mind and Senses