How to repay Christ's gift

"Christ's arrangement with us is similar to a mom providing music lessons for her child.  Mom pays the piano teacher. [...] Because mom pays the debt in full, she can turn to her child and ask for something. [...] Does the child's practice pay the piano teacher? No.  Does the child's practice repay the mom for paying the piano teacher? No.  Practicing is how the child shows appreciation for mom's incredible gift.  [...]  Mom's joy is found not in getting repaid, but in seeing her gift used: seeing her child improve."

- Brad Wilcox ("His Grace is Sufficient")