The truths of God's word are not mere sentiments, but the utterances of the Most High. He who makes these truths a part of his life becomes in every sense a new creature. He is not given new mental powers, but the darkness that through ignorance and sin has clouded the understanding is removed. CT 452.2
The words, “A new heart also will I give you” (Ezekiel 36:26), mean, A new mind will I give you. This change of heart is always attended by a clear conception of Christian duty, an understanding of truth. The clearness of our view of truth will be proportionate to our understanding of the word of God. He who gives the Scriptures close, prayerful attention will gain clear comprehension and sound judgment, as if in turning to God he had reached a higher plane of intelligence. CT 452.3
If the mind is set to the task of studying the Bible, the understanding will strengthen and the reasoning faculties will improve. Under the study of the Scriptures the mind expands and becomes more evenly balanced than if occupied in obtaining information from books that have no connection with the Bible. CT 452.4