Charles Spurgeon Commentary 1 Corinthians 3:20-21

"and again, The Lord knoweth the reasonings of the wise that they are vain. Wherefore let no one glory in men. For all things are yours;" — 1 Corinthians 3:20-21 (ASV)

And again, The Lord knoweth the thoughts of the wise, that they are vain. Therefore let no man glory in men.

Men are poor things to glory in.