are sure = have got to know. Greek. ginosko See App-132. See note on Joh_1:10.
that Christ = the Messiah. App-98.
the Son of . . . God. Thus, the second portion of the Lords ministry ends with a similar declaration on the part of Simon Peter, as in Mat_16:16, though not the same occasion. So the Syriac reads, showing that the various readings of the Greek need not be heeded. See App-94.
the living God. This expression always implies the contrast with all other gods.