Matthew Poole and continuators on 2 Peter 1:12

12 Wherefore I will not be negligent to put you always in remembrance of these things, though you know them , and be established in the present truth .

i. e. I will be diligent and careful.

He prevents an Objection, q. d. though ye know these things already, yet being things of great moment, and you being beset with Temptations, encompassed about with Infirmities, and while you are on the Earth, being in a Land of Forgetfulness, it is necessary to put you in mind of what you know, that ye may remember to do it. See the like, Rom. 15.14, 15. and 1 Iohn 2.21.

The Truth of the Gospel now revealed to you; that which was the great Subject of the Apostles Preaching and Writings, that Jesus Christ was the Christ; That Redemption was wrought by him; That he was risen from the dead; That whosoever believed on him, should receive Remission of Sins, &c. the Promise made to the Fathers being now fulfilled, Acts 13.32, 33. and what was future under the Old-Testament, being present under the New.