因为我们是不完美的灵魂，所以我们的知识是不完美的。学习的历史是克服我们错误的冒险。错误没有罪。罪恶是我们不愿意检查自己的信念，并认为我们的当局不会错。
(Because we are imperfect souls, our knowledge is imperfect. The history of learning is an adventure in overcoming our errors. There is no sin in being wrong. The sin is in our unwillingness to examine our own beliefs, and in believing that our authorities cannot be wrong.)