John Calvin on 2 Peter 1:9

9. But he that lacketh these things. He now expresses more clearly that they who profess a naked faith are wholly without any true knowledge. He then says that they go astray like the blind in darkness, because they do not see the right way which is shewn to us by the light of the gospel. “He is blind, (manu palpans) stroking with the hand,” is Calvin's; the Vulgate is manu tentans, “feeling with the hand:” but the original word means, “closing the eyes,” according to the Greek grammarians, Hesychius and Suidas: “He is blind, closing his eyes.” — Ed. This he also confirms by adding this reason, because such have forgotten that through the benefit of Christ they had been cleansed from sin, and yet this is the beginning of our Christianity. It then follows, that those who do not strive for a pure and holy life, do not understand even the first rudiments of faith.

But Peter takes this for granted, that they who were still rolling in the filth of the flesh had forgotten their own purgation. For the blood of Christ has not become a washing bath to us, that it may be fouled by our filth. He, therefore, calls them old sins, by which he means, that our life ought to be otherwise formed, because we have been cleansed from our sins; not that any one can be pure from every sin while he lives in this world, or that the cleansing we obtain through Christ consists of pardon only, but that we ought to differ from the unbelieving, as God has separated us for himself. Though, then, we daily sin, and God daily forgives us, and the blood of Christ cleanses us from our sins, yet sin ought not to rule in us, but the sanctification of the Spirit ought to prevail in us; for so Paul teaches us in 1 Corinthians 6:11, “And such were some of you; but ye are washed,” etc.

2 Peter 1:10-15

10. Wherefore the rather, brethren, give diligence to make your calling and election sure: for if ye do these things, ye shall never fall:

10. Quamobrem magis, fratres, studete firmam vestram vocationem et electionem facere: Haec enim si feceritis, non cadetis unquam:

11. For so an entrance shall be ministered unto you abundantly into the everlasting kingdom of our Lord and Saviour Jesus Christ.

11. Sic enim abundè subministrabitur vobis ingressus in regnum eternum Domini nostri et Servatoris Jesu Christi.

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

12. Itaque non negligam semper de iis commonefacere, etiamsi noveritis, et confirmati sitis in praesenti veritate.

13. Yea, I think it meet, as long as I am in this tabernacle, to stir you up by putting you in remembrance;

13. Justum autem arbitror, quandiu sum in hoc tabernaculo, vos admonitione;

l4. Knowing that shortly I must put off this my tabernacle, even as our Lord Jesus Christ hath shewed me.

14. Quum sciam brevi me depositurum hoc tabernaculum, quemadmodum et Dominus Jesus manifestavit mihi.

15. Moreover I will endeavour that ye may be able after my decease to have these things always in remembrance.

15. Dabo autem operam, ut etiam semper post meum discessum possitis horum habere memoriam.