1 Thessalonians 3:10

Night and day praying exceedingly that we might see your face, and might perfect that which is lacking in your faith?

Night and day (note, 1 Thessalonians 2:9). Night is the season for the saints' holiest meditations and prayers (2 Timothy 1:3).

Praying. What thanks can we render to God, praying as we do, etc.? [ Deomenoi (G1189), a beseeching request.]

Exceedingly, [ huperekperissou (G5240a)] - 'more than exceeding abundantly' (cf. Ephesians 3:20).

That which is lacking. Even the Thessalonians in some things needed improvement (Luke 17:5). Their doctrinal views as to the nearness of Christ's coming, and the state of those asleep, and their practice in some points needed correction (1 Thessalonians 4:1). Paul's method was to begin by commending what was praiseworthy, then to correct what was amiss: a good pattern to all admonishers.