The below is the sentence from "Divine Institute" by Lactantius. That which has an end does not contain the chief good. But the chief good is contained in that spiritual life which we acquire by ourselves, because it cannot contain evil, or have an end; to which subject nature and the system of the body afford an argument. Could you explain what the "afford an argument" means in this context? I have looked it up and it seems that the meaning of "afford" here is a little different from how I usually use this word.