Leaving all to follow Jesus
Well, I perceived reading this story that I'm not better than that rich young ruler. And as I reckoned with this, I considered it not coincidental that this account immediately follows the Pharisee and the tax gatherer praying in the temple.
Jesus told the rich young ruler that to inherit eternal life he had to part with his dough. But the tax gatherer went down to his house justified, without walking away from his dough. He walked away from his spiritual pride.
It occurs to me that until you're ready to walk away from your pride, you can't expect the power from God to walk away from anything else. It's better to be a tax gatherer, enslaved to money, than a Pharisee, enslaved to self-righteousness.