Jamieson, Fausset and Brown on Titus 1:3

3. in due times--Greek, "in its own seasons," the seasons appropriate to it, and fixed by God for it (Ac 1:7).

manifested--implying that the "promise," Tit 1:2, had lain hidden in His eternal purpose heretofore (compare Col 1:26; 2Ti 1:9, 10).

his word--equivalent to "eternal life" (Tit 1:2; Joh 5:24; 6:63; 17:3, 17).

through preaching--Greek, "in preaching," of rather as Alford (see on 2Ti 4:17), "in the (Gospel) proclamation (the thing preached, the Gospel) with which I was entrusted."

according to--in pursuance of (compare 1Ti 1:1).

of God our Saviour--rather as Greek, "of our Saviour God." God is predicated of our Saviour (compare Jude 25; Lu 1:47). Also Psa 24:5; Is 12:2; 45:15, 21, Septuagint. Applied to Jesus, Tit 1:4; Tit 2:13; 3:6; 2Ti 1:10.