This story shows us two paths.
That of the rich, young, powerful person. Popular, diligent, but fundamentally not willing to commit everything to following God.
Or the disciple. One who trusts entirely in God to be sustained, fulfilled, and stores up wealth that cannot be eaten away.
It's easy to see the difference in a passage like this, but sometimes seeing the difference in real life (even in our own lives) can be a lot harder.
Which type of Christian do you want to be?