Abu at-Tayyib al-Mutanabbi - Fie'ry Rashness

Fie'ry rashness may as valour be seen
And nervous anger may cowardice mean
Arms are carried by people everywhere
But not all claws are lion's, nor as keen.

Abu at-Tayyib al-Mutanabbi

http://www.poemhunter.com/poem/fie-ry-rashness/