The Scofield Bible Commentary, by Cyrus Ingerson Scofield, [1917], at sacred-texts.com
comforteth
Encourages; and so also where "comfort," etc, occurs in following verses.
salvation
(See Scofield) - (Rom 1:16).
grace
Grace (imparted). (Co2 4:15); (Rom 6:1); (Pe2 3:18).
day of
(See Scofield) - (Co1 1:8).