'Courageous' in the Bible

Be on guard; stand firm in your faith [in God, respecting His precepts and keeping your doctrine sound]. Act like [mature] men and be courageous; be strong.

To my shame, I must say, we have been too weak [in comparison to those pseudo-apostles who take advantage of you].But in whatever anyone else dares to boast—I am speaking foolishly—I also dare to boast.