“For this cause also thank we God without ceasing, because, when ye received the word of God which ye heard of us, ye received it not as the word of men, but as it is in truth, the word of God, which effectually worketh also in you that believe.” I Thessalonians 2:13
The difference between a Christian and a sinner is that a sinner can read the word and it can get lodged in his brain, but for the Christian, the word goes far beyond something the mind comprehends, but it works effectively in those who believe.