"[The mystery] is not something intellectual, something we only know or read about."
Grace does not destroy nature but perfects it.—St. Thomas Aquinas, Summa Theologica, Part 1, 1:8.
One sure way to inhibit spiritual growth is to assume the spiritual life requires little or no commitment of either the intellect or will. Either conclusion, i.e., little investment or no investment, would annihilate the fact that man is called by God to ongoing repentance, that each person is called to work out his salvation in fear and trembling (Philippians 2:12) so that he may freely cooperate with God's grace to grow in holiness.
We may very well read Scripture and be drawn by the word of God closer to the Word of God, Jesus Christ, for He is mediated through His word. Hence, "ignorance of Scripture is ignorance of Christ"—St. Jerome. The intellect receives and processes the truth which it perceives, and the will then is configured to that truth, or not if one is habituated to a particular sin. We should all be careful no to drive a wedge between the heart and the head when approaching mystery.