Ellicott's Commentary for English Readers - John 3:12
(12) Earthly things—i.e., things upon earth, having the sphere of their action upon earth. These are not necessarily restricted to the subjects of this interview. The context includes previous witness borne by Him, and there must have been much which is unrecorded. (Comp. John 2:23.) But the new birth is not excluded from “earthly things,” because it is the entrance to a life which, while it is spiritual, is still a life upon earth.Heavenly things, in the same way, are things which have the... read more
Ellicott's Commentary for English Readers - John 3:11
(11) Once again the “Verily, verily” of deeper truth. “We speak that we do know” is in sharp contrast to their formal teaching of matters external to the truth. The plural is not usual in the language of Christ, and the immediate passage to the singular forbids us to accept the usual grammatical explanation that it is the plural of majesty. He apparently joins others with Himself,—those who have spoken and known and testified, and whose testimony has been rejected by the Jews. We have to think... read more