Darwin worried about the relationship between what he said and the truths of religion, but he could proceed, he could write books about his subject without having to say what the relationship was to the religious claims, and similarly, geologists increasingly could talk about it.
Darwin mengkhawatirkan adanya koneksi antara perkataannya dengan kebenaran versi agama, namun beliau dapat terus menulis buku mengenai subyeknya, tanpa harus menghubungkannya dengan klaim-klaim agama. Hal yang sama terjadi juga pada kaum geologis.