Full knowledge of the Holy Spirit is far beyond anyone's meager mind. Only the Father and Son know him, and he them. And this is life eternal, to know you, who are the true God, and him whom you have sent, Jesus Christ. He who loves me will be loved by my Father, and I will love him and manifest myself to him. We begin with faith and make progress with obedience.
Obedience produces purity, and purity produces understanding.
He who believes in me, as the Scriptures have said, rivers of living water shall issue from his belly. The wise man understands that his teaching must be accommodated to that of our Lord, his Apostles, and the fathers. Though methods of training may change with time and circumstances, the substance of revelation must be the same. There are no new truths about God. It is not sophisticated inquiry, but faith which opens the darkened mind and sheds the light of truth within.