Strength in Scripture is rarely about swagger. It is courage under pressure, steadiness when fear rises, and reliance on God when your own resolve runs thin. Start with these passages, then read the surrounding chapters.
Joshua 1:9
A charge to be strong and courageous—not because the path is easy, but because God goes with you.
JOS.1.9
9 Have I not commanded you? Be strong and courageous. Do not be afraid; do not be discouraged, for the Lord your God will be with you wherever you go.”
Be strong in the Lord; real armor is spiritual, not performative toughness.
EPH.6.10-11
The Armor of God
10 Finally, be strong in the Lord and in his mighty power. 11 Put on the full armor of God, so that you can take your stand against the devil’s schemes.