2Pet 3:1

“From this we learn that the epistles of the Apostle Peter are only two. "I stir up by way of reminder in them" means: in these epistles or by these epistles I stir up your pure mind. For it is characteristic of a pure mind to remember what has been heard or commanded for salvation, and to be stirred up to fulfill this in deed with all strength and zeal.”

“I am writing to you, dear ones, in these letters, in which I stir up your sincere mind in remembrance: that you should be mindful of the words which were spoken before by the holy prophets, and of the commandment of us the apostles of the Lord and Savior Jesus. From these, we learn that there are two universal letters of Peter. Furthermore, what he says, "in which I stir up your sincere mind by way in remembrance," is to be understood in this way: In which letters, that is, through which letters, I stir up the sincere mind that is in you. For it is the nature of a sincere and pure mind to remember and be stirred up with all virtue and readiness of spirit regarding what has been heard or the useful things that have been deposited, in order to repeat the actions of these. However, these have been deposited through prophetic sayings and apostolic preachings. For this reason, Paul also says: "Built upon the foundation of the apostles and prophets:" (Eph. 2:20) For all of them announced the coming of the Lord, both the first and the second, and it is not right to doubt such great and numerous witnesses. And what do I say, he asks, about the prophets and apostles, who announced both the first and the second coming of the Lord? And this is how the order should be taken: that you should be mindful of the words which were spoken before by the holy prophets, and of the commandment of us the apostles of the Lord and Savior. For the preposition ὑπὸ is taken from the common, that is, "by". And why Peter should order this remembrance to be stirred up, he adds: Because those who live addicted to passions according to their own desires, seeing the coming of God, are afraid, which the Lord himself also announced along with others divinely inspired, and therefore despising their dishonorable life: then also seeing that the words do not immediately take effect, but are delayed for the salvation of many, they approach the faithful as if they were deceivers, and say:”