deu - [IC] Therefore, since you have seen the state of the pure religion, of the wise knowledge and the *uncrooked truth so therefrom (i.e. from the letter? or from Manuščihr’s argumentation?) which is testified by my heart, that (means) you are also steadfast in the ‘not (if my) bones’ (that) Spitāmān Zardušt said.
deu - [West1882] On that account, when you have seen the pure, religiousness, the learned knowledge, and the repose-promoting truth of the invisible (avenâpih) of which my1 heart is leaping with evidence, so that you are steadfast even unto the nôit asta-ca ('not though the body') of which Zartosht the Spitaman spoke — ...