Ephesians 6:10 “Finally, be strong in the Lord and in the strength of his might.”
So there are two things that come to mind when I read this verse.
1) A song I remember singing as a kid – “Jesus us loves me this I know, for the Bible tells me so, Little ones to him below, they are weak but He is strong.” We are taught from the get go that He is strong!
2) The story of David & Goliath. Goliath was giant, and David was a young man. He was the youngest of the family. Yet through the strength of the Lord, he not only defeated Goliath, but killed him!
So with that said, what is your Goliath that you think is soooo big that you need to defeat? The strength comes from the Lord.