In view of his approaching death (2 Pet 1:14) and the appearance of insolent mockers (2 Pet 3:3), the loving apostle deemed it necessary to write to his beloved children a new, second epistle.
In them, that is, both in the first epistle and in this second one, by way of reminder I stir up (2 Pet 1:13) your pure mind, or pure thought. This stands in contrast to the gloomy, or darkened, thought of the false teachers.
The pure mind of which the apostle speaks is the state of an enlightened soul. In it a man, by the action of God's grace, is cleansed from every spiritual impurity. In thought, he is cleansed from doctrinal error. In heart and will, he is cleansed from sinful desires and feelings.
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In his whole life he is cleansed from moral defilements. Then the light of the Christian man so shines before men that the name of God is always glorified by them (Mt 5:16; 1 Cor 5:8; 2 Cor 1:12).
"In these epistles, or by these epistles, I stir up your pure mind. For it belongs to a pure mind to remember what has been heard or commanded for salvation, and to be stirred to fulfill it in deed with all strength and zeal.
"This was commanded through the preaching of the prophets and apostles. For all of them proclaimed the coming of the Lord. One cannot disbelieve so many witnesses. They proclaimed both the first and the second coming of our Lord and Savior Himself" (Theophylact).