In Da 11:25 'courage' is the rendering of the Heb. word for 'heart'; in Am 2:16 'courageous' is literally 'stoutest of heart.' Elsewhere in the OT the root-ideas of the words generally used are 'to be firm' ('
And he shall stir up his power and his courage against the king of the south with a great army; and the king of the south shall wage war in battle with an extremely large and powerful army; but he shall not stand; for they shall devise plans against him.
and he who is courageous among the mighty will flee away naked on that day," says the LORD.
From there the brothers, when they heard of us, came to meet us as far as The Market of Appius and The Three Taverns. When Paul saw them, he thanked God, and took courage.
For our wrestling is not against flesh and blood, but against the rulers, against the powers, against the world's rulers of this darkness, and against the spiritual forces of wickedness in the heavenly places.