Reasonable proof
But what is a sufficient, reasonable proof that a man does (in the sense above) cast out devils? The answer is easy. Is there full proof, first, that a person before us was a gross, open sinner? Second, that he is not so now, that he has broken off his sins and lives a Christian life? And third, that his change was wrought by his hearing this man preach? If these three points are plain and undeniable, then you have sufficient, reasonable proof, such as you cannot resist without willful sin, that this man casts out devils.
1771 text
3. “But what is a sufficient, reasonable proof that a man does (in the sense above) cast out devils?” The answer is easy. Is there full proof, 1. That a person before us was a gross, open sinner? Secondly, That he is not so now; that he has broke off his sins, and lives a Christian life? And, thirdly, That his change was wrought by his hearing this man preach? If these three points be plain and undeniable, then you have sufficient, reasonable proof, such as you cannot resist without wilful sin, That this man casts out devils.