3. filthy—literally, "spoiled," or, "soured," "corrupted" (Job 15:16; Ro 3:12).

     10-12. As it is written, &c.— (Ps 14:1-3; 53:1-3). These statements of the Psalmist were indeed suggested by particular manifestations of human depravity occurring under his own eye; but as this only showed what man, when unrestrained, is in his present condition, they were quite pertinent to the apostle's purpose.