I do not hear any one glory that he knows the contents, but that he hath a book written in letters of gold. And what gain, tell me, is this? The Scriptures were not given us for this only, that we might have them in books, but that we might engrave them on our hearts.
For this kind of possession, the keeping the commandments merely in letter, belongs to Jewish ambition; but to us the Law was not so given at all, but in the fleshy tables of our hearts. And this I say, not to prevent you from procuring Bibles, on the contrary, I exhort and earnestly pray that you do this, but I desire that from those books you convey the letters and sense into your understanding, that so it may be purified when it receiveth the meaning of the writing.
For if the devil will not dare to approach a house where a Gospel is lying, much less will any evil spirit, or any sinful nature, ever touch or enter a soul which bears about with it such sentiments as it contains. Sanctify then thy soul, sanctify thy body, by having these ever in thy heart, and on thy tongue. For if foul speech defiles and invites devils, it is clear that spiritual reading sanctifies and draws down the grace of the Spirit.
St. John Chrysostom, Homilies on St. John, Homily 32, NPNF 1st series, Vol. 14, p. 114