Converted is simply the Latinized rendering of the word to turn round (convertere). Rev. renders the aorist participle, denoting a definite act, by once: “when once thou hast turned again.”
Strengthen (στήρισον)
See on Luk 16:25, and 1Pe 5:10. Rev., stablish, which is much better. Strengthen may denote only a temporary effect. The word implies fixedness.