Here is, 1. The character of wicked people; he means those that are
openly and grossly wicked: They forsake thy law. Every sin is a
transgression of the law, but a course and way of wilful and avowed sin
is downright forsaking it and throwing it off. 2. The impression which
the wickedness of the wicked made upon David; it frightened him, it put
him into an amazement. He trembled to think of the dishonour thereby
done to God, the gratification thereby given to Satan, and the
mischiefs thereby done to the souls of men. He dreaded the consequences
of it both to the sinners themselves (and cried out, O gather not my
soul with sinners! let my enemy be as the wicked) and to the interests
of God's kingdom among men, which he was afraid would be thereby sunk
and ruined. He does not say, "Horror has taken hold on me because of
their cruel designs against me," but "because of the contempt they put
on God and his law." Sin is a monstrous horrible thing in the eyes of
all that are sanctified, Jer. v. 30; xxiii. 14; Hos. vi. 10; Jer. ii.
12.