"Imagine a morning in late November. A coming of winter morning more than twenty years ago." It's my favorite opening in fiction, the first two lines of Truman Capote's A Christmas Memory.
When you're sucking it up until it hurts, that's when you will know your sacrifice is making a difference for your kids.
Think back on the greatest gift you've ever received. What was it? Now, give the gift exchange a 180 degree turn, and remember the favorite gift you've ever given?