And the experience I'm referring to is that which the Bible speaks of. An example is found in Ephesians 4. God gave different offices in the church so that the church would grow...till we all come in the unity of the faith, and of the knowledge of the Son of God...
The unity of the faith is concerning doctrine. That is, what the Bible teaches. The knowledge of the Son of God is experiential knowledge wherein one experiences the truth of the doctrine for themselves.
Perhaps some examples will help. Have you ever read a passage of scripture and later been meditating on it and God opens your understanding and you understand more fully what the passage entails. It was always true, yet your understanding was lacking. Now it is not. Just as Jesus opened the understanding of those men on the road to Emmaus, He came to you and did the same thing. This is an example of knowledge of the Son of God.
I could spend the day enumerating example after example of this, and am happy to share more if you like. But it is this knowledge of the Son of God that Paul gives as his reason for counting all things as loss...Philippians 3:8. And no doubt it has been the motivation behind many of the lives of saints throughout history.