But you, beloved, building up yourselves in your most holy faith, praying in the Holy Spirit,
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Aquinas Study Bible
AD 2017
building yourselves: To forever reform themselves according to the Holy Spirit’s guidance; in other words, by building congregations up, by their preaching, in the teaching of the Holy Spirit. (Oecumenius)
praying in the Holy Spirit: To pray in the Spirit always means to offer prayer to God with a clean conscience and a pure faith. If we live a good life the Holy Spirit dwells with us and we can receive what we ask for. (Ambrosiaster Eph 6:18)
Building yourselves: That is, raising by your actions a spiritual building, founded 1. upon faith; 2. on the love of God; 3. upon hope, whilst you are awaiting for the mercies of God, and the reward of eternal life; 4. joined with the great duty of prayer. (Witham)