That carries anger as the flint bears fire:

Who, much enforced, shows a hasty spark,

And straight is cold again.

Cassius: Hath Cassius liv’d

To be but mirth and laughter to his Brutus

When grief and blood ill-tempered vexeth him?

Brutus: When I spoke that, I was ill-tempered too.

Cassius: Do you confess so much? Give me your hand.

Brutus: And my heart too.

Cassius: O Brutus!