Over 30 times in Scripture, we are commanded to be strong. Why so often? I think because all of us at times feel unsure and inadequate and not up to the tasks before us. The incredible promise God gives is that He will give us His strength for what we need. Our role is simply to stand firm in the victory that Christ has already won.
Finally, be strong in the Lord and in his mighty power. Put on the full armor of God, so that you can take your stand against the devil’s schemes. For our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the spiritual forces of evil in the heavenly realms. Therefore put on the full armor of God, so that when the day of evil comes, you may be able to stand your ground, and after you have done everything, to stand.Ephesians 6:10-13