In conclusion of chapter three, Paul quotes a fragment of what appears to be an early hymn. While there is some discussion about the meaning of these phrases, the beauty and reverence of these six lines is evident.
Look for yourself in 1 Timothy 3:16:
Paul refers again to the “mystery.” This is a subject he has already addressed in verse 9, when he wrote of the “deep truths of the faith.” The same word is used in both cases. But what mystery? The mystery of our faith is God’s redemptive work in Jesus, which wasn’t seen in earlier days, but which has now been revealed in Christ. This godliness is, in a very real way, the basis of Christianity.
The next portion of this passage describes this mystery of godliness. It is almost certainly a portion of an early hymn, based upon the structure and flow of the six lines. However, there are a few pieces which aren’t completely clear as to their meaning.
Also, the dynamics can change as well, depending upon where you divide the passage. Is it three stanzas of two lines each? Or two stanzas of three lines each? Most of the commentaries I examined are divided on this issue, with a few even suggesting several different scenarios.
My inclination is to see this as two stanzas of three lines each, enabling us to see something of this mystery.