प्राणशक्तौ निरुद्धायां मनो राम विलीयते ।द्रव्यच्छायानु तद्द्रव्यं प्राणरूपं हि मानसम्
In plain words
When the power of prāṇa is checked, O Rāma, the mind dissolves — as a shadow follows its substance, so mind follows prāṇa, for the mental is, in truth, of the very form of prāṇa.