Do not lay up for yourselves treasures upon earth, where moth and rust destroy, and where thieves break in and steal. But lay up for yourselves treasures in heaven, where neither moth nor rust destroys, and where thieves do not break in or steal; for where your treasure is, there will your heart be also. Matthew 6:19-21
This verse is a reminder that while we may strive to gain all sorts of wealth, possessions and other worldly things while we're on this earth, those things are temporary and will only be destroyed by rust, stolen or taken away when we die. It is best for us to remember where our true treasure lies, the treasure that can't be destroyed. We can then go about building up our treasure in heaven, which means our hearts will also be there as well.