Jamieson, Fausset and Brown on Luke 18:22

22. lackest ... one thing--Ah! but that a fundamental, fatal lack.

sell, &c.--As riches were his idol, our Lord, who knew if from the first, lays His great authoritative grasp at once upon it, saying, "Now give Me up that, and all is right." No general direction about the disposal of riches, then, is here given, save that we are to sit loose to them and lay them at the feet of Him who gave them. He who does this with all he has, whether rich or poor, is a true heir of the kingdom of heaven.