Gripped by the gravity of the promises he was making to LaShonne, Jonathan found himself stumbling as he repeated his wedding vows. He thought, How can I make these promises and not believe they’re possible to keep? He made it through the ceremony, but the weight of his commitments remained. After the reception, Jonathan led his wife to the chapel where he prayed—for more than two hours—that God would help him keep his promise to love and care for LaShonne.

Jonathan’s wedding-day fears were based on the recognition of his human frailties. But God, who promised to bless the nations through…