Jamieson, Fausset and Brown on 2 Timothy 1:18

18. grant unto him--as well as "unto his house" (2Ti 1:16).

the Lord--who rewards a kindness done to His disciples as if done to Himself (Mt 25:45).

of--from the Lord; "the Lord" is emphatically put instead of "from Himself," for solemnity and emphasis (2Th 3:5).

in how many things--"how many acts of ministry he rendered."

unto me--omitted in the oldest manuscripts, so that the "ministered" may include services rendered to others as well as to Paul.

very well--rather as Greek, "Thou knowest better" (than I can tell thee, seeing that thou art more of a regular resident at Ephesus).