After my mission, my Grandparents had a surprise for me. As my Grandpa had recently purchased a new more reliable vehicle for themselves, they had saved their former vehicle for me, a Gold Ford 4 door in good working order. For technical reasons, the law required a payment to transfer ownership. So, in order to officially sell it to me, we wrote up the paperwork and I paid him the minimum legal asking price = $1. Once that transaction was complete, I was a happy 100% car owner. A new world had opened up to me.
Similarily, after our missions in the pre-existence, our Father in Heaven had a wonderful surprise for us. He had prepared an entire new world for us to live in. He had provided not only the world itself, but everything in it, including our physical bodies. The minimum legal requirement for us to use this gift is called the Law of Tithing.