“While we look not at the things which are seen, but at the things which are not seen: for the things which are seen are temporal; but the things which are not seen are eternal.”
2 Corinthians 4:18

“For we are saved by hope: but hope that is seen is not hope: for what a man seeth, why doth he yet hope for?”
Romans 8:24

“For we walk by faith, not by sight”
2 Corinthians 5:7

“Now faith is the substance of things hoped for, the evidence of things not seen.”
Hebrews 11:1

“Who against hope believed in hope, that he might become the father of many nations, according to that which was spoken, So shall thy seed be. And being not weak in faith, he considered not his own body now dead, when he was about an hundred years old, neither yet the deadness of Sarah’s womb: He staggered not at the promise of God through unbelief; but was strong in faith, giving glory to God;  And being fully persuaded that, what he had promised, he was able also to perform.”
Romans 4:18-21