John Gill Commentary Matthew 19:20

"The young man saith unto him, All these things have I observed: what lack I yet?" — Matthew 19:20 (ASV)

The young man says to 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.