Sometimes God does things we can't understand. This is where our need to walk by faith and not by sight comes in play. We trust in God's purpose, and his purpose often manifests itself in the least likely of sources-the mustard seed, for example. A young man on a cross, dying alone and mocked, was the mustard seed out of which a global religion, one billion strong, grew. This is the story of so many other influential Christians, such as Francis of Assisi, Charles Lwanga and Mother Teresa. They could have been easily overlooked, forgotten, ignored, but instead they sprouted into among the most revered in our history. This is a lesson of not giving up. It's a lesson of walking by faith, and not by sight.
Bishop Barron’s Sunday Sermons - Catholic Preaching and Homilies