just prior to a story's climax, a conscious choice by the Main Character to either Change or remain Steadfast with no way of knowing for sure which will best lead him to his goal or resolve his personal problem
No Main Character can be sure that he will succeed until the story has completely unfolded. Up until that moment, there is always the opportunity to change one's approach or one's attitude. For example, a Main Character may determine that what he thought was the true source of the problem really is not. Or he may reconsider his motivation to try and resolve it; whether he should give up or try harder. Again, there is no way for him to tell with certainty which path will lead to success. Nevertheless, when these scenarios close in on a single moment in the story, the moment of truth, where the Main Character has his last opportunity to remain steadfast in his approach and attitude or to change either or both, there will be a Leap of Faith. After that, all that remains is to see it to its conclusion, good or bad. That moment of truth is called the Leap of Faith because the Main Character must choose a course and then commit himself to it, stepping into the unknown with blind faith in a favorable outcome or resignation to an ostensibly poor one.