 Edwards thinks that reason can prove that God exists, establish many of his attributes, discern our obligations to him, and mount a probable case for the credibility of scripture. But he also believes that grace is needed both to help the natural principles “against those things that tend to stupefy [them] and to hinder [their] free exercise,” and to sanctify “the reasoning faculty and” assist “it to see the clear evidence there is of the truth of religion in rational arguments” (“Miscellanies,” nos. 626, 628; Edwards 1957–, vol. 18, 155, 156f).