This is a challenge in a world where we are encouraged at every turn to be “self confident”. It is considered a strength. In God’s world (Kingdom) it is not a strength. Our confidence should be in God. It is His strengths that are important.
God is God. It is all about him and what he wants. God is the strong one.
Finally, be strong in the Lord and in the strength of His might. Ephesians 6:10