There are few circumstances which so strongly distinguish the philosopher, as the calmness with which he can reply to criticisms he may think... →
Charles Babbage
Calmness is the cradle of power.
Josiah Gilbert Holland
What is deservedly suffered must be borne with calmness, but when the pain is unmerited, the grief is resistless.
Ovid
Nothing is so aggravating than calmness.
Oscar Wilde