As I'm hugging Max, just after spanking him for throwing a fit:
Me: Maximus, I do not like spanking you. It makes me so sad when you make choices that mean you have to get a spanking. I always hope that you can make good choices so that I won't have to spank you.
Max: (tears streaming down his face) But.. Mommy... It's really hard to go the whole day without making bad choices!
Me: I know, buddy. None of us can go a single day without making bad choices.
Me: Because we are all sinners. That's why we need Jesus so much.
Max: But why did Jesus die for us while we were his enemies?
Me: Because He loved us so much that He wanted to make a way to forgive us of our sins so that we could be in His family.
Max: But Mommy, your only bad choices are arguing with Daddy.
Me: Oh, I have a lot more sins than that. Like when I'm lazy and don't do the work I should do. Or when I don't treat others with real kindness.
Max: Woh. That IS a bad choice.
Me: I know. Big time.
And then he smiles at me and scampers away to play, eyes red and swollen, but hopefully with the seeds of the Gospel planted in his tender heart.