My Secret Weapon

I have a secret weapon that no one knows about I hide it in my mind and use it when in doubt My weapon isn't big then again it isn't small my weapon doesn't have a shine but still saves me when I fall I have another weapon that I hide under my bed the only way to use it is with my little head My weapon can be used for both good and evil things but my weapon is a secret so shhhhh don't say nothing