Elisha Gray Quote

It is the province of the scientist to reveal the facts of nature as they now exist, and leave the rest to the speculation of the philosopher and the theologian. The growth of vegetation made it possible for animal and insect life to exist, and the earth teemed with both; first of an inferior kind, but later, as the conditions for a higher order of life were right, the higher order came with the improved conditions. In this way was the earth through countless ages of time prepared for man — God's highest creation.

Familiar talks on science, Volume 2 (1900), p. 157 - Nature's Miracles (1900)