Do what you are afraid to do
The moral duty to be expected in different ages is not a unity of standard, or of acts, but a unity of tendency. At one time the benevolent affections embrace merely the family, soon the circle expanding includes first a class, then a nation, then a coalition of nations, then all humanity and finally, its influence is felt in the dealings of man with the animal world.
Courage is not limited to the battlefield or the Indianapolis 500 or bravely catching a thief in your house. The real tests of courage are much quieter. They are the inner tests, like remaining faithful when nobody's looking, like enduring pain when the room is empty, like standing alone when you're misunderstood.