Frank J. Wilstach, comp. A Dictionary of Similes. 1916.
Coward
Base and crafty cowards are like the arrow that flieth in the dark.
—Francis Bacon
A coward in the field, is like the wise man’s fool; his heart is at his mouth, and he doth not know what he doth profess: but a coward in his faith, is like a fool in his wisdom; his mouth is in his heart, and he dares not profess what he does know.
—Arthur Warwick