Avatarika
तस्यैव हृदयाख्यस्य ब्रह्मणः सत्यमित्युपासनं विधित्स-न्नाह—
In plain words
Having shown that Brahman as the heart, he now wants to teach us to hold that same Brahman in mind under a new name — Truth. So he says—
Close to the Sanskrit
Wishing now to prescribe the meditation called 'Truth' upon that very Brahman known as the heart, he says—