 And David promises to be the one who will fight. In verse 32 of our reading from 1 Samuel 17, it says, And David said to Saul, Let no man's heart fail because of him. That is, because of Goliath. Let no man's heart fail because of the nine-foot-six giant standing out in the middle of the valley, armed to the teeth, who's threatening to overcome all of Israel. Don't let your heart fail, he says.