"The previous paragraph [1] has been a challenge to the several groups in the Cretan churches to accept the specifically Christian pattern of behavior. Its presuppositions may at first sight seem prosaically humdrum and conventional, but Paul now eloquently reminds Titus that they have their basis in the gospel itself. It was precisely in order to raise men to a higher quality of life that God intervened in history in the incarnation." [1][source]
"There are few passages in the New Testament which so vividly set out the moral power of the Incarnation as this passage does." [3][source]
This is another of the "liturgical passages" in the Pastorals that summarize essential features of salvation (cf. 1 Timothy 1:15; 1 Timothy 2:5-6; 1 Timothy 3:16; 2 Timothy 1:9-10; 2 Timothy 2:8-13; Titus 3:3-7). [4][source]