Adam Clarke on 1 Thessalonians 3:10

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.