Charles H. Spurgeon on Psalms 14:1

"They are corrupt, they have done abominable works." Sin pleaseth the flesh. Omne simile nutrit simile. Corruption inherent is nourished by the accession of corrupt actions. Judas's covetousness is sweetened with unjust gain. Joab is heartened and hardened with blood. 1 Kings 2:5. Theft is fitted to and fatted in the thievish heart with obvious booties. Pride is fed with the officious compliments of observant grooms. Extortion battens in the usurer's affections by the trolling in of his moneys. Sacrilege thrives in the church-robber by the pleasing distinctions of those sycophant priests, and helped with their not laborious profit. Nature is led, is fed with sense. And when the citadel of the heart is once won, the turret of the understanding will not long hold out. As the suffumigations of the oppressed stomach surge up and cause the headache, or as the thick spumy mists, which vapour up from the dark and foggy earth, do often suffocate the brighter air, and to us more than eclipse the sun, the black and corrupt affections, which ascend out of the nether part of the soul, do no less darken and choke the understanding. Neither can the fire of grace be kept alive at God's altar (man's heart), when the clouds of lust shall rain down such showers of impiety on it. Perit omne judicium, cum res transit ad affectum. Farewell the perspicuity of judgment, when the matter is put to the partiality of affection. Thomas Adams.