In his book Immeasurable, Skye Jethani writes:

Compare two leaders. Leader A lifted an entire nation in a time of despair. He mobilized his people against unimaginable odds with a clear vision and inspiring passion. He launched a movement that has impacted literally everyone alive today. He set in motion an industrial and scientific revolution that produced the first computer, the first jet airplane, began human exploration of space, and unlocked the mystery of nuclear energy. Almost every aspect of the modern world has, in one way or another, been influenced by this man. By the time he died at the age of only 56, everyone on the planet knew his name. Without a doubt, Leader A changed the world.

Leader B lived during the same era. In fact, he died just 21 days before Leader A, but his life was very different. At the height of his influence, Leader B ran a school with just 100 students. He wrote a few books but was not widely regarded. He was beloved by his friends and family and had a reputation for being both intelligent and faithful, but at the time of his death almost no one knew his name, and most considered his life's work unfulfilled—including Leader B himself.

So given the choice, which leader's strategies would you rather study? Which leadership conference would you rather attend—the one featuring a keynote address by Leader A or the one with the small workshop in a back hall led by Leader B? If you are inspired by the world changing effectiveness of Leader A, congratulations! You've chosen Adolf Hitler. Leader B was Dietrich Bonhoeffer, the German pastor who was executed by the Nazis for his relentless opposition to Hitler.