Complete this phrase small as a mouse, big as a

I have no arms, yet I hold, I bring you warmth against the cold. I never speak, yet offer you peace, I’m always there when you fall asleep.

If you live in one of these, you shouldn't be throwing any mineral-based objects, or else you might break something. What am I?

I change with minds and point of view, what’s true to me may not be to you.

What am I? I heal your pain, I was used before paper existed and I present you the world at your fingertips.