Newton's 3rd Law

Hard-hearted, you call me.

That's what happens when

The volcano of self-protecting anger

Ignites and overflows,

Gushing down and- finding no outlet-

Fills the rib cage,

Superheating that small organ.

When the danger passes

The heart cools down

But it has been tempered by

The need to act and

The impossibility of action.

Hard-hearted, you say?

I am basalt.