Jamieson, Fausset and Brown on 2 Peter 1:16

16. For--reason why he is so earnest that the remembrance of these things should be continued after his death.

followed--out in detail.

cunningly devised--Greek, "devised by (man's) wisdom"; as distinguished from what the Holy Ghost teaches (compare 1Co 3:13). But compare also 2Pe 2:3, "feigned words."

fables--as the heathen mythologies, and the subsequent Gnostic "fables and genealogies," of which the germs already existed in the junction of Judaism with Oriental philosophy in Asia Minor. A precautionary protest of the Spirit against the rationalistic theory of the Gospel history being myth.

when we made known unto you--not that Peter himself had personally taught the churches in Pontus, Galatia, &c., but he was one of the apostles whose testimony was borne to them, and to the Church in general, to whom this Epistle is addressed (2Pe 1:1, including, but not restricted, as First Peter, to the churches in Pontus, &c.).

power--the opposite of "fables"; compare the contrast of "word" and "power," 1Co 4:20. A specimen of His power was given at the Transfiguration also of His "coming" again, and its attendant glory. The Greek for "coming" is always used of His second advent. A refutation of the scoffers (2Pe 3:4): I, James and John, saw with our own eyes a mysterious sample of His coming glory.

were--Greek, "were made."

eye-witnesses--As initiated spectators of mysteries (so the Greek), we were admitted into His innermost secrets, namely, at the Transfiguration.

his--emphatical (compare Greek): "THAT great One's majesty."