"The Rule of ME"

Today, my son decided on a flowery, linen dress he wanted me to wear. But it was pouring out and I told him that the day was too cold for that. He goes, "But Mommeee, I'm trying to help you decide." And I said, "Beta, when you help someone, you have to tell them what's the right thing for them, not what you want them to do!?!" And he looks at me, all angry, lips quivering, eyes all dark, and snaps right back, "Ya, but this is the rule of ME!!!" and crosses his arms and runs into his room! I was so taken aback at the sheer cuteness of it all. Why do kids grow up so soon?