We Must Learn to Loathe Sin

Ye that love the LORD, hate evil. [Psalm 97:10] It is evident that our conversion is sound when we loathe and hate sin from the heart: a man may know his hatred of evil to be true, first, if it be universal: he that hates sin truly, hates all sin. Secondly, true hatred is fixed; there is no appeasing it but by abolishing the thing hated. Thirdly, hatred is a more rooted affection than anger: anger may be appeased, but hatred remains and sets itself against the whole kind. Fourthly, if our hatred be true, we hate all evil, in ourselves first, and then in others; he that hates a toad, would hate it most in his own bosom. Many, like Judah, are severe in censuring others (Ge 38:24), but partial to themselves. Fifthly, he that hates sin truly, hates the greatest sin in the greatest measure; he hates all evil in a just proportion. Sixthly, our hatred is right if we can endure admonition and reproof for sin, and not be enraged; therefore, those that swell against reproof do not appear to hate sin.
–Richard Sibbes.