In so many of the miracles recorded in the New Testament, Christ instructs those in need to do something. He instructed Lazarus to "come forth" from his tomb, the blind man to "go wash" the clay from his eyes, the man with palsy to "take up thy bed, and go thy way", his disciples to "give them to eat" when feeding the five thousand, and the ten lepers to "go shew yourselves unto the priests." His mother Mary, even before all of this, leads into the first recorded miracle by giving a succinct set of instructions that would ring true for anyone who ever would experience a miracle through his word, saying: "Whatsoever he saith unto you, do it." (John 2:5)
We should be like the servants at that feast that listened to Mary, who when directed by Jesus to "fill the waterpots with water" then did "to the brim" (John 2:7).
In all of these actions, however, we can never take credit for the thing. We don’t earn the thing, but that doesn't mean we don't have some part to play in receiving the thing. Blessings always require us to put ourselves in a position or location to receive them. How easy and human it is though to confuse this with doing something to earn them.
Think of it like being invited to a meal – we have to go (and be somewhat on time) to eat. If we don’t show up, we won't be able to enjoy the gift (which doesn't mean the gift wasn't prepared or given or that it would have been worth having). The act of going does not by any stretch of the imagination, however, mean we made, earned, or even deserve the gift. It is still a gift.
So when we, like the young ruler, ask "What lack I yet?" we should be ready to show up and act in order to receive the gift God would give us – which gift may include us giving up even more of those things that seem so valuable but are ultimately perishable. And then we should give thanks for all of it, remembering:
"And in nothing doth man offend God, or against none is his wrath kindled, save those who confess not his hand in all things, and obey not his commandments. (Doctrine & Covenants 59:21)
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Cover image credit: https://www.lds.org/media-library/images/christ-rich-young-ruler-hofmann-1020802?lang=eng