'Wholeheartedness' is about sincerity and commitment. We could describe Abraham that way. He was so God-fearing and committed that he was willing to sacrifice his only son Isaac (see Genesis 22:1-19 for a reminder). That's sincere faith, right there. And when we see how God responded to this kind of faith it's a good reminder of how we should be willing to live. God said, through an angel, that he would certainly bless Abraham (see Genesis 22:17). Then he said, 'You have obeyed me, and so you and your descendants will be a blessing to all nations on earth' (Genesis 22:18 CEV).
When we're willing to go the extra mile for God, he certainly notices. When we learn to live out our faith with heart, he blesses whatever we do for him. Now this doesn't mean that playing in the worship group has a direct correlation to the dollars in our bank balance. It does mean that when we give of ourselves wholeheartedly, living with a generous heart, we'll see God at work and learn to recognise his blessings in many ways.
So what now? Have a wardrobe clear out. Among the too-small shirts and last year's jeans in the discard pile, include something you really like and wear often. If Abraham was prepared to sacrifice his son, you can sacrifice that favourite shirt. Give the clothes to someone who's struggling to buy new ones or, if you don't know anyone who is, take them to a charity shop.