Studying this scripture, a question sprang up in my mind: Does this mean that the Holy Ghost is deficient in knowledge?

What does Paul mean when he says, "the Spirit searches everything, even the depths of God"? When we use the word search, we usually refer to the act of trying to find something we want to locate or discover. If I am on a quest for knowledge, a search for knowledge, I am trying to learn something I do not presently know. So, when Paul says the Spirit searches the depths of God, he seems to be implying that the third person of the Trinity is pursuing some knowledge that He lacks.

But if we conclude that there are certain things the Holy Spirit does not know and needs to learn, our doctrine of the Trinity is destroyed. Such a lack of knowledge in the Spirit would deny His deity as a member of the Godhead. So, we must approach the question from the other direction, accepting what the rest of Scripture teaches about the Spirit—that He is a part of the Godhead and therefore omniscient.

Thus, He does not search the depths of God to increase His own knowledge. On the contrary, Paul is telling us here that the Holy Spirit searches the depths of God for us. The Spirit acts as a searchlight and shines on the text of Scripture when we read it, giving us the capacity to understand the meaning of it. When this happens, we see the truth of God intensely and sharply.

Every one of us who is a Christian has had this experience sometime in his or her life. We are reading from the Scriptures, and suddenly a particular truth seems to jump off the page and pierce our souls. That is the work of the Holy Spirit in illumination.