Charles Robert Darwin (18091882). Origin of Species. The Harvard Classics. 190914.
But with regard to the material world, we can at least go so far as thiswe can perceive that events are brought about not by insulated interpositions of Divine power, exerted in each particular case, but by the establishment of general laws.
The only distinct meaning of the word natural is stated, fixed, or settled; since what is natural as much requires and presupposes an intelligent agent to render it so, i.e., to effect it continually or at stated times, as what is supernatural or miraculous does to effect it for one.
To conclude, therefore, let no man out of a weak conceit of sobriety, or an ill-applied moderation, think or maintain, that a man can search too far or be too well studied in the book of Gods word, or in the book of Gods works; divinity or philosophy; but rather let men endeavour an endless progress or proficience in both.