|Reason and faith don't mix!|
How do you tell me to build a big boat in the middle of dry land? Foolishness! How do you tell me I'll have a child of my own when I should already be counting grandchildren? Foolishness! How do you tell me to keep going when there's a dead end ahead and spear-happy warriors behind? Foolishness! And it will always seem that way. If you don't have faith, God's ways will never make any sense to you! His plans will never add up.
When I hear 'faith is the substance...', I imagine this: you can't see anything, but God says 'look, it's right there'. Your faith makes you believe it's there and well, what do you know, that faith becomes something concrete. It's almost as if your faith becomes visible! A substance!
So when you have faith, your reactions in the face of a hopeless situation will be to hope and trust. Just think, before the flood in Genesis, there had never been rain before! God watered the earth from the ground up. So Noah had no idea what rain looked like but "it's going to rain" was his excuse for insanity for a hundred and twenty years! Don't try to reason things out. If God says He'll do it, He can and will!
See also: 1Cor1:25, 1Cor3:19, 1Cor2:14, Isa55:8-9