But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned.
1 Corinthians 2:14 (KJV)
Spiritual truths cannot be understood or received through human reasoning or mere intellectual understanding. It requires the Spirit of God to make the things of God real to us. The more we renew our minds in the Word, the more will the Holy Spirit reveal the reality of the Word to us. And the more that the Word becomes real in our hearts, the more will we see the glory of God reflected in our lives.