Faith never asks us to take a blind leap into the darkness. However, one verse is cited as proof that blind faith is the only "evidence" we have:
“Now faith is confidence in what we hope for and assurance about what we do not see.” (Hebrews 11:1 NIV)
However, this verse does not deny the evidential foundation of faith. It merely declares that we have to walk by faith and not by sight. In fact, in its examples of people walking by faith, evidence was also present. For example, Abraham was enabled to walk in faith by sacrificing Isaac, because he had experienced the faithfulness of God:
· **By faith Abraham, when God tested him, offered Isaac as a sacrifice. He who had embraced the promises was about to sacrifice his one and only son, even though God had said to him, “It is through Isaac that your offspring will be reckoned.” Abraham reasoned that God could even raise the dead, and so in a manner of speaking he did receive Isaac back from death. (Hebrews 11:1, 17-19)
Abraham had been assured by the evidence. What evidence? God had always blessed him and bailed him out of trouble. He therefore knew, based upon this evidence, that he could invest his trust in his Lord.