When my friend Janice was asked to manage her department at work after just a few years, she felt overwhelmed. Praying over it, she felt God was prompting her to accept the appointment—but still, she feared she couldn’t cope with the responsibility. “How could I lead with so little experience?” she asked God. “Why put me here if I’m going to be a failure?”

Later, Janice was reading God’s call of Abraham in Genesis 12 and noted Abraham’s part: “Go . . . to the land I will show you. . . . So Abram went” (vv. 1, 4). This was…