Fixed purpose of heart.

Herman Witsius has written:

“Hence ariseth a steady and fixed purpose of heart, to be conformable in all things to God, Psal. cxix. 106. To whom the will wholly resigns itself up, to be swallowed, as it were, in his will; establishing this into an inviolable and sacred law for itself, to have the same inclinations, the same aversion with God. And God himself declares, that the true reverence or fear of the Deity lies in this, Prov. viii. 13. “The fear of the Lord is to hate evil; pride and arrogancy and the evil way, and the froward mouth do I hate.” He that truly fears God will hate what he knows to be hateful to God; and on the contrary love what God loves, Psal. cxxxix. 21, 22.”

(Witsius, Herman. The Economy of the Covenants Between God and Man, Volume II, Kingsburg, CA: den Dulk Christian Foundation, 1990, p. 14)