Musar do Ezechiela 21:31

And corresponding to this they said (Yalkut Shimoni Yechezkel 361): "'[So said the L-rd G-d:] I shall remove the turban and lift off the crown [the humble will be uplifted, and the high will be humbled]' (Yechezkel 21:31) - whoever is great in this world will be small in the World to Come". We also learn the opposite: if one is small in this world, his time of greatness will be in the World to Come.

The detriments of this trait are abundance and satiation in the good of this world, similar to what scripture states explicitly: "lest when you have eaten and become sated [and built good houses...] and your heart grows haughty..." (Devarim 8:12-14).

Therefore the pious deemed it good for a man to afflict himself sometimes, in order to put down the evil inclination of arrogance, which grows strong only through abundance, similar to what our sages, of blessed memory, said: "a lion does not roar over a basket of straw but over a basket of meat" (Berachot 32a).