Commentaries:
Jamieson, Fausset, and Brown
let no man glory in men—resuming the subject from I Corinthians 3:4; compare I Corinthians 1:12, I Corinthians 1:31, where the true object of glorying is stated: "He that glorieth, let him glory in THE LORD." Also I Corinthians 4:6, "That no one of you be puffed up for one against another."
For all things—not only all men. For you to glory thus in men, is lowering yourselves from your high position as heirs of all things. All men (including your teachers) belong to Christ, and therefore to you, by your union with Him; He makes them and all things work together for your good (Romans 8:28). Ye are not for the sake of them, but they for the sake of you (II Corinthians 4:5, II Corinthians 4:15). They belong to you, not you to them.
Other Jamieson, Fausset, and Brown entries containing 1 Corinthians 3:21:
Song of Solomon 8:12
Matthew 5:5
Acts 15:39
1 Corinthians 1:12
1 Corinthians 3:3
1 Corinthians 3:7
1 Corinthians 5:6
1 Corinthians 7:23
1 Corinthians 13:1
2 Corinthians 4:15
2 Corinthians 6:10
2 Corinthians 8:9
Galatians 4:1-7
Ephesians 1:22
Ephesians 5:20
Colossians 2:23
Colossians 3:11
1 Timothy 4:8
Hebrews 2:8
Revelation 21:7
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