Sparks and smoke

When scraped the steel
In the asphalt
A light comes out of the bar
It is the spark that generates

With this spark
Get out the fire
Hell, and grisly

With fire
What generates the flame
Something burning
Get out the smoke

The spark is
Signal of strength
The smoke is
Sign of courage

They are feared
Since leaving hot
And burn the best

The hot iron
The ember of coal
The spark generates
The smoke comes out