Charles H. Spurgeon on Psalms 17:1

"That goeth not out of feigned lips." There are such things as "feigned lips;" a contraction between the heart and the tongue, a clamour in the voice and scoffing in the soul, a crying to God, "Thou art my father, the guide of my youth;" and yet speaking and doing evil to the utmost of our power (Jeremiah 3:4, 5), as if God could be imposed upon by fawning pretences, and, like old Isaac, take Jacob for Esau, and be cozened by the smell of his garments; as if he could not discern the negro heart under an angel's garb. . . This is an unworthy conceit of God, to fancy that we can satisfy for inward sins, and avert approaching judgments by external offerings, by a loud voice, with a false heart, as if God (like children), would be pleased with the glittering of an empty shell, or the rattling of stones, the chinking of money, a mere voice, and crying without inward frames and intentions of service. —Stephen Charnock.