Charles H. Spurgeon on Psalms 32:6

Few verses in the Psalms are harder to be understood than this: and none has given rise to more varied expositions among the commentators. For this. Some will have it: encouraged by this example, that after so foul a fall God so readily forgave. Others again: for this, namely, warned by this example, they who are holy shall make their prayers that they may not be permitted to fall as David did. Whichever be the sense, they well argue from this passage, that the state of absolute and enduring perfection is impossible to a Christian in this life. Lorinus, and Cajetan (1469-1534), quoted by Neale.