That's awesome! Congrats to you as well!
Yes, even when we don't realize it, our kids are always watching and listening and learning from us. You are setting your son up to learn great values - hard work and perisistence.
When I had my second child, I developed serious cardiac issues and at the time didn't know what my future would hold. My son, who was elementary aged at the time naturally heard all of us adults talking about it and of course, I had explained to him why mommy had had to go back to stay in the hospital after his sibling was born (in a way appropriate for his age).
One day while jumping on the trampoline, he stopped and said, "Mommy, I will give you my heart so you'll feel better."
I had to walk away I was so emotional. It nearly ripped my heart out. The innocence and giving nature of children is one of the best, most miraculous parts of life.