Mark 10:20

And he said unto him, Teacher, all these things have I observed from my youth.

Mark omitted the key words, "What lack I yet?" (Matthew 19:20). Still, it is perfectly evident that the young man's keeping of God's commandments had nevertheless left a void in his heart. Many a person in his circumstances would have said, "I need nothing"; but it is to the great credit of this man that he recognized his soul's need, despite all of his own sincere efforts to do God's will. It is ever beyond the power of men to achieve eternal life through their own keeping of sacred law, and yet eternal life is dependent upon the perfect keeping of the sacred law. Christ achieved eternal life for all men (potentially) by his perfect keeping of all of God's commandments, and by setting up a plan by which men become a part of his true spiritual body, thus enabling them to be saved "as Christ." Yet this does not deny that salvation results from (Christ's) keeping all the commandments.