Zach had to change
I love that Zacchaeus, upon being accused of being a sinful man, proclaims that he'll give half his possessions to the poor and he'll pay back what he's extorted from folks. Love this. It's true repentance. Real repentance brings a change in behavior- it's not just a please forgive me prayer. When you truly repent, you change what you've been doing.
