Charles H. Spurgeon on Psalms 119:78

Let the proud be ashamed. He begged that the judgments of God might no longer fall upon himself, but upon his cruel adversaries. God will not suffer those who hope in his word to be put to shame, for he reserves that reward for haughty spirits: they shall yet be overtaken with confusion, and become the subjects of contempt, while God's afflicted ones shall again lift up their heads. Shame is for the proud, for it is a shameful thing to be proud. Shame is not for the holy, for there is nothing in holiness to be ashamed of.

For they dealt perversely with me without a cause. Their malice was wanton, he had not provoked them. Falsehood was employed to forge an accusation against him; they had to bend his actions out of their true shape before they could assail his character. Evidently the Psalmist keenly felt the malice of his foes. His consciousness of innocence with regard to them created a burning sense of injustice, and he appealed to the righteous Lord to take his part and clothe his false accusers with shame. Probably he mentioned them as "the proud, " because he knew that the Lord always takes vengeance on proud men, and vindicates the cause of those whom they oppress. Sometimes he mentions the proud, and sometimes the wicked, but he always means the same persons; the words are interchangeable: he who is proud is sure to be wicked, and proud persecutors are the worst of wicked men.

But I will meditate in thy precepts. He would leave the proud in God's hands, and give himself up to holy studies and contemplations. To obey the divine precepts we have need to know them, and think much of them. Hence this persecuted saint felt that meditation must be his chief employment. He would study the law of God and not the law of retaliation. The proud are not worth a thought. The worst injury they can do us is to take us away from our devotions; let us baffle them by keeping all the closer to our God when they are most malicious in their onslaughts.

In a similar position to this we have met with the proud in other octaves, and shall meet them yet again. They are evidently a great plague to the Psalmist, but he rises above them.