Charles H. Spurgeon on Psalms 17:10

"They are inclosed in their own fat." Luxury and gluttony beget vainglorious fatness of heart, which shuts up its gates against all compassionate emotions and reasonable judgments. The old proverb says that full bellies make empty skulls, and it is yet more true that they frequently make empty hearts. The rankest weeds grow out of the fattest soil. Riches and self-indulgence are the fuel upon which some sins feed their flames. Pride and fulness of bread were Sodom's twin sins. (Ezekiel 16:49.) Fed hawks forget their masters; and the moon at its fullest is furthest from the sun. Eglon was a notable instance that a well-fed corporation is no security to life, when a sharp message comes from God, addressed to the inward vitals of the body. "With their mouth they speak proudly." He who adores himself, will have no heart to adore the Lord. Full of selfish pleasure within his heart, the wicked man fills his mouth with boastful and arrogant expressions. Prosperity and vanity often lodge together. Woe to the fed ox when it bellows at its owner, the poleax is not far off.