Verse 2
third heaven
First heaven, of clouds; second, of stars; third, God's abode.
Verse 4
paradise
See note on hades, (See Scofield "Luke 16:23").
Verse 7
thorn
It has been conjectured that Paul's "thorn in the flesh" was chronic ophthalmia, inducing bodily weakness, and a repulsive appearance Galatians 4:15; 1 Corinthians 2:3; 1 Corinthians 2:4; 2 Corinthians 10:10. This cannot be positively known, and the reserve of Scripture is as sure a mark of inspiration as its revelations. Paul's particular "thorn" is not described that his consolations may avail for all to who any thorn is given.
Verse 9
perfect in
(See Scofield "Matthew 5:48").
Verse 21
sinned
Sin. (See Scofield "Romans 3:23").