Augustine of Hippo — as excerpted in the Catena Aurea on John 3:32-36

“(Tr. xiv. c. 8) Or thus; There is a people reserved for the wrath of God, and to be condemned with the devil; of whom none receiveth the testimony of Christ. And others there are ordained to eternal life. Mark how mankind are divided spiritually, though as human beings they are mixed up together: and John separated them by the thoughts of their heart, though as yet they were not divided in respect of place, and looked on them as two classes, the unbelievers, and the believers. Looking to the unbelievers, he saith, No man receiveth his testimony. Then turning to those on the right hand he saith, He that hath received his testimony, hath set to his seal.”