"... the habit of holding oneself well in hand, the being
impervious to small annoyances, cheerful under small
inconveniences, ready for action with what is called
'presence of mind' in all the little casaulties of the hour --
this is a habit which should be trained in the nursery. 'If
you are vexed, don't show it,' is usually a quite safe
teaching, because every kind of fretfulness, impatience,
resentfulness, and nervous irritability passes away under
self-control."

--Charlotte Mason, The Original Homeschooling Series