The biblical word for “prevent” meant “to anticipate, to precede, to foresee and fulfill in advance, to pay a debt before it is due.” Furthermore, in almost every instance, it implied something of pleasure.
Isaiah gives us a glimpse of this kind of pleasure. It comes from God anticipating a need and fulfilling it ahead of time. “It shall come to pass, that before they call, I will answer; and while they are still speaking, I will hear” (Isaiah 65:24, NKJV).
This verse provides us with an incredible picture of our Lord’s love for us. Evidently, he is so anxious to bless us, so ready to fulfill his lovingkindness in our lives, that he can’t even wait for us to tell him our needs. He jumps in and performs acts of mercy, grace and love toward us; and that is a supreme pleasure to him.
That is just what David was saying in Psalm 21. “Lord, you pour out blessings and lovingkindness on me before I can even ask. You offer more than I could even conceive of asking.”
David was referring to some awesome work that God performed for him both in the natural world and in the spiritual realm. God gave David victory over his enemies, answers to prayer, overcoming power and unspeakable joy; and he did much of it before David could even go to prayer, unburden his heart or present his request. Once David finally did pour out his heart, he discovered that God had already made provision to defeat his enemies. David’s victory was assured before he could even get near the battlefield.