Romans 4:13-25
No unbelief made him waver concerning the promise of God, but he grew strong in his faith as he gave glory to God, fully convinced that God was able to do what he had promised. (Romans 4:20, 21 ESV)
Abraham trusted God's promise. He wasn't the only one. There are numerous examples in scripture of God leading his people toward something, and them putting their faith in Him.
Faith in Jesus is a powerful thing. It is the foundation of hope, and the cradle of belief. It is precious. It is up-lifting. It is life-giving and life-changing.
Abraham's faith was potent, not because of his mental capacity to understand, or his soulful yearning to believe. Abraham had a complete faith, in that his faith influenced his behavior. Faith caused him to do stuff.
It is through our faith in Jesus as Lord and Savior that we find freedom from sin and death. This faith is demonstrated by our actions and reactions. It informs and influences the initiative we take to help others, and the way we respond to how we are treated. Faith carries us through hard times, but it's also through faith that we will know everlasting peace and assurance.