HAT OVER THE WALL

Throw your hat over the wall. 

In other words:  commit yourself to completing the task ahead. 

Get after it, in the name of Jesus, Amen!

JFK famously announced that the U.S. would have a man on the moon within 10 years. He said it even though the space program had not even been launched yet.  He was bold enough to toss his hat over the wall and then chase after it, even though his political opponents said it was a crazy idea.