There often seems to be a playfulness to wise people, as if either their equanimity has as its source this playfulness or the playfulness flows from the equanimity; and they can persuade other people who are in a state of agitation to calm down and manage a smile.
—Edward Hoagland
Calmness is the cradle of power.
—Josiah Gilbert Holland
Nothing contributes so much to tranquilizing the mind as a steady purpose—a point on which the soul may fix its intellectual eye.
—Mary Wollstonecraft Shelley