When you're at Wal-Mart in Show Low with your husband and baby browsing the book section, and you happen upon a children's book about loving your child.
So you open the book and read it to your son.
The book goes through all the things you love about him and ends with something like, "I loved you yesterday, I love you today, and I'll even love you tomorrow!"
When you finish, your son gets a giant smile on his face, leans forward in the shopping cart towards you, wraps his arms around you tight and gives you a hug.
Now THAT is a precious moment that should never be forgotten.