We’re urged by impulses into action. Oftentimes, the instigator is anxiety or annoyance. It seems unpleasant to be propelled by negativity, but that’s how it is.
What powers a rocket, but fiery fuel. An undirected blast is merely a destructive explosion, but if focused, a detonation sends a rocket into the desired direction.
When harnessed, unpleasant emotions become a source of propulsion. Why am I angry? Why am I scared? Because that is the fuel for pushing forward.
The problem is not fear or anger, but their proper application. Within a disciplined mind, these forces can be focused into power.