Romans 4:20, 21

He did not waver at the promise of God through unbelief, but was strengthened in faith, giving glory to God, and being fully convinced that what He had promised He was also able to perform.

What does it take to be convinced about what we don’t see? We have faith in something every day, and those things are mainly the things we can see. We become fully convinced about the promises of God through the study of the Bible. The revelation comes to us as we meditate the promises of God, and they become just as real as the world around us.