योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-83, verse-21

श्रीवसिष्ठ उवाच ।
एतदेव तदाप्यङ्ग द्वैतैक्याम्भोधिशान्तये ।
यदि चिन्मात्रनभसश्चेत्यमस्ति न किंचन ॥ २१ ॥

śrīvasiṣṭha uvāca ,
etadeva tadāpyaṅga dvaitaikyāmbhodhiśāntaye ,
yadi cinmātranabhasaścetyamasti na kiṃcana 21

21. Vasishtha replied:—O Rama! if you entertain such doubt, then hear me tell you, how you can get over the great ocean of your doubts, respecting the unity and duality of the deity:—that all things being extinct at the end, there remains the thinking and subjective intellect alone, without anything objective to think upon.