Courage enlarges, cowardice diminishes resources. In desperate straits the fears of the timid aggravate the dangers that imperil the brave. Christian Nestell Bovee
Courage stands halfway between cowardice and rashness, one of which is a lack, the other an excess of courage. plutarch
Cowardice... is almost always simply a lack of ability to suspend functioning of the imagination. Ernest Hemingway
To run away from trouble is a form of cowardice and, while it is true that the suicide braves death, he does it not for some noble object but to escape some ill. Aristotle