Night and day - Constantly.

Praying exceedingly - Greek, abundantly; that is, there was much more than ordinary prayer. He made this a special subject of prayer; he urged it with earnestness, and without intermission; compare 1 Thessalonians 2:17.

And might perfect that which is lacking in your faith - Might render it complete, or fill up anything which is missing. The word used here (καταρτίσαι katartisai), means, properly, to make fully ready, to put full in order, to make complete; see the Romans 9:22 note; 2 Corinthians 13:9 note; Galatians 6:1 note. It is rendered mending, Matthew 4:21; Mark 1:19; perfect and perfected, Matthew 21:19; Luke 6:40; 2 Corinthians 13:11; 1 Thessalonians 3:10; Hebrews 13:21; 1 Peter 5:10; fitted, Romans 9:22; perfectly joined together, 1 Corinthians 1:10; restore, Galatians 6:1; prepared, Hebrews 10:5; and framed, Hebrews 11:3. It is not elsewhere used in the New Testament. The meaning here is, that whatever was deficient in their views of religious doctrine the apostle desired to supply. It is to be remembered that he was with them but a comparatively short time before he was compelled to depart to Berea, and it is reasonable to suppose that there were many subjects on which he would be glad to have an opportunity to instruct them more fully.

Night and day praying exceedingly - Supplicating God at all times; mingling this with all my prayers; ὑπερεκπερισσου δεομενοι, abounding and superabounding in my entreaties to God to permit me to revisit you. How strong was his affection for this Church!

Might perfect that which is lacking - That I might have the opportunity of giving you the fullest instructions in the doctrine of Christ, that ye might have every thing in the most ample detail; so that the great outlines of truth which you already know may be filled up, that ye may be perfectly fitted to every good word and work.

Night and day praying exceedingly,.... This good news, not only comforted their hearts, and revived their spirits, and filled them with joy and thankfulness, but also sent them to the throne of grace to pray without ceasing, continually, night and day, and as often as they went thither, and that with great fervency and earnestness, in a multitude of petitions; or, as the Arabic version renders it, "with prayers exceeding a multitude"; with innumerable requests:

that we might see your face: once more, and converse face to face:

and might perfect that which is lacking in your faith? in the grace of faith; for though they remembered their work of faith with pleasure, and had had good tidings of it very lately, and were thankful that it grew exceedingly as it did, yet they knew it was not perfect, there was unbelief attending them: and though it is God's work to increase faith, as well as to produce it, yet, as the ministry of the word is the means of the first planting of it, so it also is of the increase of it. This may likewise be understood of the doctrine of faith, which though they had received in the love of it, and had made considerable progress in their knowledge of it; yet they knew but in part, and needed to be taught the way of God, and truths of the Gospel more perfectly; and the ministry of the word is for the perfecting of the saints in the knowledge of the Son of God, and of other truths; wherefore the apostle desired greatly to see them, that he might be an instrument of instructing them, more perfectly in the knowledge of divine things; and in this, and in the following epistle, he does particularly instruct them about the rise and fall of antichrist, the coming of Christ and the resurrection of the dead, articles of faith in which they seemed to have been deficient: but now, though these saints had deficiencies in their faith, yet they were not what the Jews call (o) , "such as are deficient in faith", or want faith entirely, a phrase somewhat like this which is here used.

(o) Maimon. Hilch. Mechira, c. 7. sect. 8, 9.

Exceedingly (ὑπερεκπερισσοῦ)

Comp. Ephesians 3:20. Paul is fond of compounds with ὑπὲρ above. Of the 28 N.T. words compounded with ὑπὲρ, 22 are found in Paul, and 20 of them only there.

Perfect (καταρτίσαι)

Primarily, to adjust, fit together; so mend, Matthew 4:21. Of the creation of the world, Hebrews 11:3. See on Matthew 21:16; see on Luke 6:40; see on 1 Peter 5:10; see on Romans 9:22.

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

(b) Paul was forced through the pressing dealing of the enemies to leave the building which he had just begun: and for that reason he had left Silas and Timothy in Macedonia, and when Timothy came to Athens to him, he sent him back again immediately. So that he desires to see the Thessalonians, that he may thoroughly perfect their faith and religion, that was as yet imperfect.

3:10 Night and day praying exceedingly. An expression of his intense longing to see again a band of young converts so tenderly endeared to him.

And may perfect that which is lacking in your faith. Instruct them more fully in knowledge and duty. So recently heathen, they needed a wise teacher very much.

3:10 And perfect that which is wanting in your faith - So St. Paul did not know that they who are once upon the rock no longer need to be taught by man.

Margin perfect

See Scofield Note: "Mt 5:48".

10. Night and day-(See on [2446]1Th 2:9). Night is the season for the saint's holiest meditations and prayers (2Ti 1:3).

praying-connected with, "we joy"; we joy while we pray; or else as Alford, What thanks can we render to God while we pray? The Greek implies a beseeching request.

exceedingly-literally, "more than exceeding abundantly" (compare Eph 3:20).

that which is lacking-Even the Thessalonians had points in which they needed improvement [Bengel], (Lu 17:5). Their doctrinal views as to the nearness of Christ's coming, and as to the state of those who had fallen asleep, and their practice in some points, needed correction (1Th 4:1-9). Paul's method was to begin by commending what was praiseworthy, and then to correct what was amiss; a good pattern to all admonishers of others.

3:6-10 Thankfulness to God is very imperfect in the present state; but one great end of the ministry of the word is to help faith forward. That which was the instrument to obtain faith, is also the means of increasing and confirming it, namely, the ordinances of God; and as faith cometh by hearing, so it is confirmed by hearing also.