Joshua 1:8 This book of the law shall not depart out of thy mouth; but thou shalt meditate therein day and night, that thou mayest observe to do according to all that is written therein: for then thou shalt make thy way prosperous, and then thou shalt have good success.
https://bibliajfa.com.br/app/kjv_apocrypha/06O/1/8
Courage is a good attribute, but a feature we need to identify about courage is that it finds it's root in total dependence on something. This is where he draws his strength from, this is where his ability comes from.
When a man so much believes in what he has or in what he carries, he will do exploit. This is the case with courage. You will be so bold and courageous when you have something backing you up, you will be confident to do anything because you have a backup.
This should be the testimony of a believer, he should trust and rely on God , he should be so confident in his God, this will make us Courageous. It's all to our advantage, trusting in God is a plus. He doesn't fail nether does he disappoint.