Jude 1:20,21 - Joseph Benson’s Commentary on the Old and New Testaments

But ye, beloved Not separating yourselves from your Christian brethren, but building up Or edifying one another in knowledge and grace; on, or in, your most holy faith The true Christian faith, having for its object all the doctrines, precepts, and promises of the gospel; a faith, than which none can be more holy in itself, or more conducive to the most refined and exalted holiness; praying in, or through, the Holy Ghost By a principle of grace derived from him, and by his enlightening, quickening, sanctifying, and comforting influences, showing you what blessings you may and ought to pray for, inspiring you with sincere and fervent desires after those blessings, and enabling you to offer these desires to God in faith, with gratitude for the blessings which you have already received. And by these means, and through divine grace communicated therein, keep yourselves in the love of God That is, in love to God, arising from a sense of his love to you; looking for the mercy, &c. Continually possessing a confident expectation of that eternal life, which is purchased for you and conferred upon you through the mere mercy of our Lord Jesus Christ.