Charles Spurgeon Commentary Mark 10:21-22

"And Jesus looking upon him loved him, and said unto him, One thing thou lackest: go, sell whatsoever thou hast, and give to the poor, and thou shalt have treasure in heaven: and come, follow me. But his countenance fell at the saying, and he went away sorrowful: for he was one that had great possessions." — Mark 10:21-22 (ASV)

Then Jesus beholding him loved him, and said unto him, One thing thou lackest: go thy way, sell whatsoever thou hast, and give to the poor, and thou shalt have treasure in heaven: and come, take up the cross, and follow me. And he was sad at that saying, and went away grieved: for he had great possessions.

Thus he proved that he had not kept either table of the law perfectly, for he did not love the Lord with all his heart, nor did he love his neighbor as himself.