The Deadliest Monster

Coming to trust Christ as your Lord and Savior requires just a bit of faith, but once you've trusted Him you may find that He expects a much bigger faith from you. This new demand for faith still won't ask you to to blind yourself- it's never irrational to trust in an all-powerful, perfectly holy God- but it may require you to follow Him in a direction you don't like and for which you can't imagine a purpose. Lewis describes this type of faith this way:

There are times when we can do all that a fellow creature needs if only he will trust us. In getting a dog out of a trap, in extracting a thorn from a child's finger, in teaching a boy to swim or rescuing one who can't, in getting frightened beginner over a nasty place on a mountain, the one fatal obstacle may be their distrust. We are asking them to trust us in the teeth of their senses, their imagination, and their intelligence. We ask them to believe that what is painful will relieve their pain and that what looks dangerous is their only safety... Sometimes, because of their unbelief, we can do no mighty works. But if we succeed, we do so because they have maintained their faith in us against apparently contrary evidence. No one blames us for demanding such faith. No one blames them for giving it. No one says afterwards what an unintelligent dog or child or boy that must have been to trust us. If the young mountaineer were a scientist, it would not be held against him, when he came up for a fellowship, that he had once departed from Clifford's rule of evidence by entertaining a belief with strength greater than the evidence logically obliged him to.
Now to accept the Christian propositions is ipso facto to believe that we are to God, always, as that dog or child or bather or mountain climber was to us, only very much more.

-From The Deadliest Monster by J.F. Baldwin pg. 100-101