"Let no man beguile you of your reward in a voluntary humility and worshipping of angels, intruding into those things which he hath not seen, vainly puffed up by his fleshly mind" [Colossians 2:18, tr. Calvin]
Calvin takes an insightful quote from Augustine in his Commentary on Colossians 2:18, regarding the puffing up that comes from false humility. He writes, "as Augustine elegantly writes to Paulinus, by wonderful means, as to the soul of man, that it is more puffed up from a false humility than if it were openly proud".
[The quote comes from Augustine's letter to Paulinus, #149/CXLIX, 2.28, fit enim miris modis in anima hominis, ut de falsa humilitate magis infletur, quam si apertius superbiret]