Indiana Jones: The Last Crusade

[Indy (Harrison Ford) has accepted the quest for the Holy Grail to save his father who has been shot by the Nazis.]

True Faith is only borne through love.  The only reason why Indy was able to make that "step" was for love of his father.  It was stated earlier in the movie too, that Indy's quest was not so much for the Grail, but rather for his father.  He is going through these tests to seek the Grail to ultimately save his father.  The Grail was the only thing that could save his father, so he sought after it, even though it seemed ridiculous.  

What is the virtue of Faith?  Believe something we know to be true, even when our senses fail in the perception of it.  If I told that you that freedom doesn't exists, you would tell me it is a lie, yet you cannot sense freedom with your physical senses.  Faith is trusting in something greater than yourself.  Indy may have failed, and fallen to his death when he stepped out, but making sacrifices, and leaps of faith for those that we love is what makes life worth living.  

Only a faith arising from a relationship, namely that of love is has power to move.  If Indy would have been out for himself, he would not have been able to get through the tests, as the other people had failed.

At the end of the clip, Indy also throws sand to show the "invisible" bridge.  If our faith is true, it shows the way to those that are behind us following, and going where we are going.  Faith is something that is meant to be shared, and to help people along the path progress forward towards the goal.  Along the way people can forget that the hear and now is not a goal, but rather our life does not reach completion until the moment of our death, and that is when the real life begins. Relationships are meant to be shared.

So why does this clip move us?  Because we want to be the hero just like Indy, we want to have his faith.  We want to believe that given the same situation, that we would be able to step out into the unknown, to put our life on the line for the sake of our loved one.