त्रीण्यात्मनेऽकुरुतेति मनो वाचं प्राणं तान्यात्मनेऽकुरुतान्यत्रमना अभूवं नादर्शमन्यत्रमना अभूवं नाश्रौषमिति मनसा ह्येव पश्यति मनसा शृणोति ।कामः संकल्पो विचिकित्सा श्रद्धाश्रद्धा धृतिरधृतिर्ह्रीर्धीर्भीरित्येतत्सर्वं मन एव तस्मादपि पृष्ठत उपस्पृष्टो मनसा विजानाति यः कश्च शब्दो वागेव सा ।एषा ह्यन्तमायत्तैषा हि न प्राणोऽपानो
In plain words
'He created three for himself'—mind, speech, and breath—these he fashioned for himself. People say, 'My mind was elsewhere, so I did not see it; my mind was elsewhere, so I did not hear it.' For it is truly with the mind that one sees, and with the mind that one hears. Desire, resolve, doubt, faith, lack of faith, steadfastness, lack of steadfastness, shame, intelligence, and fear—all these constitute the mind alone. Therefore, even when a person is touched from behind, he perceives it through the mind. Whatever sound exists, that is speech indeed.
Close to the Sanskrit
'Three he made for himself'—mind, speech, and breath; these he made for himself. 'My mind was elsewhere, I did not see; my mind was elsewhere, I did not hear,' for with the mind indeed one sees, with the mind one hears. Desire, resolve, doubt, faith, lack of faith, steadfastness, restlessness, modesty, intellect, fear—all this is mind alone. Therefore, even when touched from behind, one knows with the mind. Whatever sound there is, that is speech indeed...