All these things have I kept from my youth up - I have made them the rule of my life.
I have endeavored to obey them. Is there anything that I lack - are there any new commandments to be kept? Do you, the Messiah, teach any command besides those which I have learned from the law and from the Jewish teachers, which it is necessary for me to obey in order to be saved?

All these have I kept - I have made these precepts the rule of my life. There is a difference worthy of notice between this and our Lord's word. He says, Matthew 19:17, τηρησον, keep, earnestly, diligently, as with watch and ward; probably referring not only to the letter but to the spirit. The young man modestly says, all these (εφυλαξα) have I observed; I have paid attention to, and endeavored to regulate my conduct by them. I have kept them in custody.
From my youth - Several MSS., versions, and fathers, leave out these words. Grotius and Mill approve of the omission, and Griesbach leaves them in the text with a note of suspicion. Perhaps the young man meant no more than that he had in general observed them, and considered them of continual obligation.
What lack I yet? - He felt a troubled conscience, and a mind unassured of the approbation of God; and he clearly perceived that something was wanting to make him truly happy.

The young man saith unto him,.... For though he was so very rich and in such an exalted station in life, as to be a ruler, it seems he was but a young man; and to be so early serious and religious, amidst so much riches and grandeur, though it was but externally, was both remarkable and commendable: upon hearing the answer of Christ, with which he was highly pleased and greatly elated, he very pertly replies,
all these things have I kept from my youth up: as soon as he was capable of learning, his parents taught him these precepts; and ever since he had the use of his reason, and understood the letter, and outward meaning of them, he had been careful to observe them; nor could he charge himself with any open and flagrant transgression of them; not understanding the internal sense, extensive compass, and spirituality of them; and therefore asks,
what lack I yet? In what am I deficient hitherto? in what have I come short of doing these things? what remains at last to be performed? what other precepts are to be obeyed? if there are any other commands, I am ready to observe them, which may be thought necessary to obtain eternal life.

All these have I kept from my youth up. There was, no doubt, great ignorance in this reply.
What lack I yet? He was sensible of the fact that there was a lack. His soul had not found rest in outward duties.

The young man saith, All these have I kept from my childhood - So he imagined; and perhaps he had, as to the letter; but not as to the spirit, which our Lord immediately shows.