_Knowing this first, that no prophecy of Scripture is of private interpretation._ The Greek words need to be taken account of before we can gather the true meaning of this clause. That which is translated "is" is much more frequently rendered "comes to pass," and bears the sense of "arises," "has its origin." "Interpretation" is the translation of a word which occurs here only in the New Testament, and implies the "loosing" of what is complicated, the "clearing" of what is obscure. The lesson which the Apostle would give relates to the right appreciation of the Old Testament Scriptures, which contain the prophecy which he has called above "the lamp in a dark place." He intends to say something which may incline men to follow its guidance. The prophetic writings furnish us with illustrations how the problems which arose in the lives of the men of old time, both about events around them and also about the dispensations of Divine providence, found their solution. Thus they furnish rules and principles for time to come; and that men may be induced to confide in their guidance is the object of St. Peter's words. He bids the converts know that these unravellings and clearings of the ways of God are not men's private interpretation of what they beheld. This was not the manner in which they came to be known. They are not evolved out of human consciousness, pondering on the facts of life and the ways of God, nor are they the individual exposition of those whom God employed as His prophets. They are messages and lessons which came from one and the same impelling power, from one and the same illuminating influence, even from God Himself, and so are uniform in spirit and teaching from first to last; and He from whom and through whom they are given can say by the mouth of the last of the prophetic body, "I am Jehovah; I change not" (Mal. iii. 6).
Although the Apostle uses in this Epistle the word "Scriptures" (iii. 16) for the writings of New Testament teachers, it is not likely that he in mind included them among the prophetic Scriptures of which he here speaks. We, knowing the flood of light which the Gospels and Epistles pour upon the Old Testament, can now apply his words to them, fully perceiving that they are a true continuation of the Divine enlightenment, another spring from the same heavenly fountain.
Those who would explain "interpretation" as the judgement which men now exercise in the study and application of the words of Scripture forget the force of the verb (γίνεται) "comes to pass," and that the Apostle is exalting the source and origin of the words of prophecy, that he may the more enforce his lesson, "Ye do well to take heed to them."
_For no prophecy ever came by the will of man._ Prophecy makes known what never could have entered into the mind or understanding of men, nor were the prophetic words that have come down to us written because men wished to publish views and imaginations of their own. Man is not the source of prophecy. That lay above and beyond the human penmen. Nay, men could not, had they so willed, have spoken of the things there written for the enlightenment of the ages. These are deep things, belonging to the foreknowledge of God alone, by whom His Son was foreknown as the Lamb without spot before the foundation of the world. Of this the book of prophecy tells from first to last: of the seed of the woman to bruise the serpent's head; of the family from which a seed should come in whom all the earth should be blessed; of the rod to spring from the stem of Jesse; of the king who was to rule in righteousness; of the time when the kingdom of the Lord's house should be established on the top of the mountains, and all nations should flow into it; of the day when all men should know the Lord from the least to the greatest, when the earth should be full of the knowledge of the Lord as the waters cover the sea. Such tidings came not into the thoughts of men except as they were put there from the Lord; and they tell of things yet to come that are beyond the grasp of men unless they be spiritually-minded and enlightened. For not only are the prophetic Scriptures God's special gift: the insight into their full meaning comes also from Him. Beyond the physical sense it is true, "The hearing ear and the seeing eye, the Lord is the Maker of them both" (Prov. xx. 12).