We apply the same logic to the rightful use of our resources. We say, in so many words, what really matters is that you give your heart to Jesus and then you can do whatever you want to with your money and time.
I'm afraid such an approach leads too easily down the well-trodden path of self-deception. It's almost as if this language is a trump-card to avoid any call to obedience or any challenging conversation. To put it more forcefully, perhaps the church has reaped a harvest of souls, but we have not reaped many people who are willing to seek first the kingdom and restructure their lives in light of its coming.
Furthermore, the assumption that we can reduce everything to a personalized decision of what the heart is focussed upon misrepresents what Jesus taught. Jesus does not say, where your heart is there your treasure will be. Instead, he offers a more challenging statement: "Where your treasure is, there you heart will be also" (Matthew 6.21). Do you see the difference? The latter focusses upon something much more concrete. It forces to think about what we treasure more than anything else, what has captured our imagination, what's central in helping us make decisions. And part of Jesus' concern is money in this text. Just a few verses later, Jesus says, "You cannot serve both God and Money."
All of this leads me to a series of questions. How much influence does money have on our lives? Is that our true treasure? Is that what matters to us more than anything else? Can we look at our checkbooks and discern where our true treasure is? Or is that too simplistic? Those are great questions to ponder as we continue to reflect upon what it means to be disciples in God's coming kingdom.
Peace.