Now about the midst of the feast, &c.— About the middle of the feast (which lasted eight days) Jesus came into the temple, and preached many important doctrines with such strength of reason, clearness of method, and elegance of expression, that his enemies themselves were astonished, knowing that he had never had the advantage of a liberal education. What is here more particularly meant by letters, appears from the Greek word Γραμματα, whence is derived that which signifies a scribe. The learningof the scribes consisted in the explication of the sacred writings of the Old Testament; so that these words most probably refer to our Lord's great acquaintance with the scriptures, and the judicious and masterly manner in which he taught the people out of them, with far greater majesty and nobler eloquence than the scribes could attain to by a learned education. Compare Matthew 7:29 and Mark 1:22.
Related Commentaries of John 7:14
John 7:14-15
14 Now about the midst of the feast Jesus went up into the temple, and taught.
15 And the Jews marvelled, saying, How knoweth this man letters,a having never learned?