And he answered and said unto him, Teacher, all these have I observed from my youth.
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Augustine of Hippo
AD 430
But the young man went away sad, so anyone can see how far he kept those commandments of the law. I think he spoke with more pride than truth when he answered that he had kept them. Letter , To Hilarius.
We must recollect, that to the faithful observers of the Mosaic law, not only present goods were given, but the happiness of a future life promised. Hence our Lord with reason inquired, whether he had kept the commandments. The innocent life of this young man is deserving of our imitation. (Ven. Bede)