What does the Bible say about faith not based on sight?

In Mark 8:10-13, Jesus confronts the Pharisees, who demanded a sign to prove His authority. He responds by highlighting that their request stems from a hardened heart and unbelief. The Lord indicates that faith is not based on miraculous signs but on the preached Word; as stated in Romans 10:17, 'Faith cometh by hearing, and hearing by the word of God.' This teaches us that genuine faith is not reliant on visual proof but is instead a response to the truth of God's Word as it is revealed to us through preaching and Scripture.