Verse 15

चित्त त्वमथ दृश्यं च द्वे एव यदि सन्मये ।सदास्थिते तत्प्रसरः कुतो हर्षविषादयोः

In plain words

Citta, if you and the dṛśya, the two of you, are made of sat and abide forever, whence then the surge of joy and sorrow?