Oecumenius

Therefore, beloved, since you know this beforehand, take care that you are not led astray by the error of the wicked and fall from your own commitment, but grow in grace and knowledge of our Lord and Savior Jesus Christ. To Him be glory both now and to the day of eternity. Amen. Truly, he calls faith in the Lord its own commitment. And just as he concludes in his other Epistle with prayer, so in this one, he prays for an increase in faith in the Lord for them.

Commentary on 2 Peter ↗

Bede

You therefore, brothers, being forewarned, be on guard, etc. Being forewarned, because foolish ones will introduce various errors, some denying the future judgment, some falsifying divine words, some interpreting wrongly, some loosening the restraints of luxury, others deceiving the hearts of the wretched with other fraudulent deceptions, be on guard, lest by any cunning of deceivers you might fall from the firmness of your faith.

Commentary on the Catholic Epistles ↗