Faith can be a noun (in which case it applies to the object of our faith) or as a verb (in which case it applies to the trust/reliance in that object).
I'll address it from the standpoint of the verb since that's the use we commonly use and as I think the OP means it...
"Faith" = to trust, to rely. Especially trust and reliance in something that cannot be empiracally proven. Theologically, to trust and rely on God.
When I was a kid, I had surgery (long story, doesn't matter). Anyway, I was just old enough to know I could die - and what that meant. I actually was okay with that. It had very little to do with heaven (a concept not yet in my heart or head) but with 1 John 4:8, "We rely on the love of God, because God is love."
I remember meeting the surgeon in the hospital - and that he kept calling me by the wrong name (Joe, I think). I realized, he doesn't know me - much less love me or even care about me. That was powerful. And yet, Mom and Dad told me he was a good doctor and God could use him. I was okay with that... I remember being moved onto the cold, hard table with the huge light above me - although by this time I was already very sleepy - fighting that as best I could.
I didn't know anything about the surgery, I didn't know anything about this surgeon, and clearly he knew nothing about me (not even my name) - or any of the rest of the staff involved in all this. And yet, I entrusted my life. Willingly. And I sooooo remember being okay wih that. I sooooo remember thinking: no matter what, it's okay, God loves me, and all that I love.
While my reliance was active on my part (I placed my life in their hands), there were no "works" on my part involved. There was no "obedience" other than I laid limp and allowed to happen whatever happened.
I know how planes fly; I understand the principles involved. Still, whenever I board one of those HUGE planes, I am amazed. They are soooooo big and heavy! And inside, they are STUFFED with overweight Americans (probably more so than the engineers planned for), and under them, all their luggage - too much. It's always the same. I look at those wings and that curvature and think, "no way!" And, of course, I don't know the pilot and he doesn't know me (or care). I don't know the flight plan or the weather report. I don't know the mechanics or their reports or when this plane was last overhauled. In fact, I know NOTHING about this particular plan or crew or flight. And I realize that when a plane stops working at 40K feet, well, it means we'll all be meeting Jesus. While the ODDS of that are very small, that means little for this particular flight - this could be that 1% (or whatever). It bothers me not. I board the plane. And as it takes off, as it's going down the runway, I hope to be able to see the wings and sit (passively!) in awe of it all, and then, surprisingly soon, the wheels chirp, and the plane rises - gloriously, and Hawaii is just 5 hours away.
Faith and Knowledge certainly have a relationship, but it's not a causitive or mechanical one, but rather a relational one. See my two illustrations above.
To insist that faith is the RESULT of knowledge is to deny that those below a certain IQ or age are capable of faith and therefore of salvation. And, IMO, undermines the very nature of faith which is to rest, rely, trust.
I am well aware that I can't "prove" much of anything in my heart. Actually, I "understand" probably LESS today than I did 3 or 4 years ago, more aware of the questions than the answers I have, more aware of mystery. It hasn't impacted my faith at all (if anything, it's increased it).
Luther said, "Faith is a busy, active thing." Faith changes us - from the inside out, and that reveals itself in genuine, not forced, things. Faith that is just some claim, words we chant, is not faith. Just chanting the right syllables is not faith.
There's two senses in which faith is to be active:
1. Faith causes us to rely, to rest, to trust. To use the airplane illustration above, another person may have the exactly same information (or LACK thereof!!!!) and yet does not board the plane. In his/her case, there is no faith. The irony is that faith, while active, is rest - and therefore passive.
2. Faith is a change in our heart and results in a change in our lives. "By their fruits you will know them." "Faith without works is dead." A good tree bears fruit. But don't press this TOO far! The "transformation" of faith is not complete (this side of heaven), we remain here always incomplete, always saint AND sinner at the same time. And while faith is constant, the opportunities are not. To insist, for example, that there must be tangible good works - helping the little old lady across the street - would be to insist that a baby cannot have faith and therefore cannot be saved. I think the thief on the cross had faith and salvation - as far as I can tell from the text, he did NOTHING after coming to faith. To make works a requirement is to proclaim he went to hell. The principle is sound, but it shouldn't be pressed too far.
Just my half cent....
Pax
- Josiah