Verse 40

एतावन्मात्रकं मन्ये रूपं चित्तस्य राघव ।यद्भावनं वस्तुनोऽन्तर्वस्तुत्वेन रसेन च

In plain words

I hold, O Rāghava, that this alone is the form of citta: the imagining, within, of an object as a real thing, and with relish.