Years ago, a young man decided he wanted to run a marathon. He wasn’t fast, he wasn’t athletic, and he wasn’t even particularly motivated at first. But he made one simple commitment: every morning, no matter the weather, no matter how he felt, he would run.

The first week was miserable. His legs burned, his lungs ached, and his body protested. But he kept running. The second week wasn’t much better—but he kept running. By the third week, something changed. His legs grew stronger. His breathing steadied. His pace improved.

One day a friend asked him, “How did you go from barely jogging a mile to running twenty?” The young man smiled and said, “I didn’t train my legs first…I trained my mind. Once my mind was committed, my body followed.”

That’s the power of commitment. Not convenience. Not emotion. Not inspiration. Commitment. And beloved, what that young man discovered physically is what God calls us to spiritually.

Joshua is about to lead a nation, and he is about to...