"Mátali: I will tell you. Perceiving that your Majesty's spirit was completely broken by some distress of mind under which you were labouring, I determined to rouse your energies by moving you to anger. Because To light a flame, we need but stir the embers; The cobra, when incensed, extends his head And springs upon his foe; the bravest men Display their courage only when provoked."
January 1, 1970
https://en.wikiquote.org/wiki/Shakuntala_(play)