Matthew Poole and continuators on Proverbs 30:22

22 For a servant when he reigneth , and a fool when he is filled with meat ;

When he is advanced to great Power and Dignity; for such an one is ignorant and unfit for his place, and therefore commits many errours, he is poor, and therefore an insatiable oppressor, according to Prov. 28. 3. he is proud and imperious, and being maligned and hated by others, he is provoked to hate them, and to be injurious and cruel to them.

A conceited and wilful fool, or an obstinately wicked man.

Either 1. When he is glutted with meat or drink, which dulls mens Reason, and heats their Blood, and stirs them up to many insolencies. Or rather 2. When he abounds in Wealth, which in that case is like a Sword in a mad mans hand, being an instrument and occasion of innumerable wickednesses and mischiefs, as appears from common experience.

Marginal references: Ch. 19. 10▪ Eccl. 10. 7.