Jude 1:20

Building up yourselves - Having the most holy faith - the Gospel of our Lord Jesus, and the writings of his apostles, for your foundation; founding all your expectations on these, and seeking from the Christ who is their sum and substance; all the grace and glory ye need.

Praying in the Holy Ghost - Holding fast the Divine influence which ye have received, and under that influence making prayer and supplication to God. The prayer that is not sent up through the influence of the Holy Ghost is never likely to reach heaven.

But ye, beloved, building up yourselves on your most holy faith - Compare the notes at Jde 1:3. On the word "building," see the 1 Corinthians 3:9-10 notes; Ephesians 2:20 note. It is said here that they were to "build up themselves;" that is, they were to act as moral and responsible agents in this, or were to put forth their own proper exertions to do it. Dependent, as we are, and as all persons with correct views will feel themselves to be, yet it is proper to endeavor to do the work of religion as if we had ample power of ourselves. See the notes at Philippians 2:12. The phrase "most holy faith" here refers to the system of religion which was founded on faith; and the meaning is, that they should seek to establish themselves most firmly in the belief of the doctrines, and in the practice of the duties of that system of religion.

Praying in the Holy Ghost - See the notes at Ephesians 6:18.

1:20 But ye, beloved, not separating, but building yourselves up in your most holy faith - Than which none can be more holy in itself, or more conducive to the most refined and exalted holiness. Praying through the Holy Spirit - Who alone is able to build you up, as he alone laid the foundation. In this and the following verse St. Jude mentions the Father, Son, and Spirit, together with faith, love, and hope.