The Swiss Theologian Karl Barth famously wrote:
"The fact that I live in the faith of the Son of God, in my faith in him, has its basis in the fact that He Himself, the Son of God, first believed for me ... the great work of faith has already been done by the One whom I follow in my faith, even before I believe, even if I no longer believe, in such a way that He is always, as Heb 12:2 puts it, the originator and completer of our faith ... His faith is the victory which has overcome the world" (CD II/2, 559).
This is largely derived from his reading of Galatians 2:20, but with a particular emphasis on Jesus’s own faithfulness in the translation.
“I have been crucified with Christ and I no longer live, but Christ lives in me. And the life that I now live in my body, I live by faith, indeed, by the faithfulness of God’s Son, who loved me and gave himself for me” (Gal 2:20, CEB).
We can explore further what it means to entrust oneself to the faithfulness of the Son of God!