A.T. Robertson Commentary 1 Timothy 1:17

"Now unto the King eternal, immortal, invisible, the only God, [be] honor and glory forever and ever. Amen." — 1 Timothy 1:17 (ASV)

This noble doxology is a burst of gratitude for God's grace to Paul. For other doxologies see Ga 1:5; Romans 11:36; 16:27; Php 4:20; Ephesians 3:21; 1 Timothy 6:16. White suggests that Paul may have often used this doxology in his prayers. Lock suggests "a Jewish liturgical formula" (a needless suggestion in view of Paul's wealth of doxologies seen above). For God's creative activity (King of the ages) see 1 Corinthians 10:11; Ephesians 2:7; 3:9,11.

Incorruptible (αφθαρτω). As an epithet of God also in Ro 1:23.

Invisible (αορατω). Epithet of God in Col 1:15.

The only God (μονω θεω). So Ro 16:27; John 5:44; 17:3.

For ever and ever (εις τους αιωνας των αιωνων). "Unto the ages of ages." Cf. Ephesians 3:21 "of the age of the ages."