The proud have greatly scorned me This example is eminently useful, as it serves to inform us, that though our honesty may render us obnoxious to the insults of the ungodly, we ought, by our unflinching constancy, to repel their pride, lest we should take a dislike to the law of God. Many who, in other respects, would be disposed to fear God, yield to this temptation. The earth has always been filled with the impious contemners of God, and at this day it is almost overrun with them. Wherefore, if we do not disregard their reviling, there will be no stability in our faith. In calling unbelievers proud, he applies to them a very appropriate designation: for their wisdom consists in despising God, lightly esteeming his judgments, trampling all piety under foot, and, in short, pouring contempt upon the celestial kingdom. Were they not blinded with pride, they would not follow such a headlong course. We must interpret the words in this manner: Though the proud have treated me with scorn, I have not turned aside from thy law. We must not overlook the,, particle very much, or greatly, which imports, that he was harassed, not merely occasionally or for a short time, by the ungodly, but that the attack was continued from day to day. Let us learn from these words, that the wicked, in consequence of their forming the great majority of mankind, arrogate to themselves the greater liberty. The number of the godly who worship God reverently is always small. Hence we must hold out against a large troop and rabble of the impious if we would maintain our integrity.

The proud have had me greatly in derision - Those of rank; those in high life: perhaps, as we should say, the frivolous and fashionable world. They have ridiculed me; they have held me up to contempt for my scruples, my seriousness, my conscientiousness, my unwillingness to mingle with them in the pursuits, the pastimes, the frivolities of life. It is now no new thing to be held in contempt by the "proud" and the frivolous, on account of serious piety; to be thus held in contempt has been rather the rule than the exception in the treatment which the friends of religion have received from the world.
Yet have I not declined from thy law - I have not been deterred from the avowal of my religious belief; I have not turned away from the duties of piety on account of the ridicule and scorn to which I have been exposed. Compare Psalm 44:17-19.

The proud have had me - We have been treated, not only with oppressive cruelty, but also with contempt, because we still professed to trust in thee, the living God, who because of our transgressions hadst been greatly displeased with us; jet we have not declined from thy law.

The (b) proud have had me greatly in derision: [yet] have I not declined from thy law.
(b) Meaning the wicked who contemn God's word, and tread his religion under foot.

The proud have had me greatly in derision,.... Profane sinners, proud and haughty scorners, that make a jest of religion, and scoff at everything serious and good: these derided the psalmist for his piety and religion, his principles and practices; in which he was a type of Christ, who was both the song of the drunkards, and was derided by the proud and haughty Scribes and Pharisees; as all self-righteous persons are, they who trust in themselves, and despise others, Psalm 69:11;
yet have I not declined from thy law; from walking according to it, as a rule of life and conversation; from professing and maintaining the doctrine of the word, the truths of the Gospel, he had knowledge and experience of; and from going on in the ways of God and true religion he was directed in; and this testimony the Lord himself gave of him, 1-Kings 14:8 see Psalm 44:19.