17 Ye, then, beloved, knowing before, take heed, lest, together with the error of the impious being led away, ye may fall from your own stedfastness,
17
Therefore, dear friends, since you have been forewarned, be on your guard so that you may not be carried away by the error of the lawless and fall from your secure position.
18 and increase ye in grace, and in the knowledge of our Lord and Saviour Jesus Christ; to him [is] the glory both now, and to the day of the age! Amen.
18
But grow in the grace and knowledge of our Lord and Savior Jesus Christ. To him be glory both now and forever! Amen.
Young's Literal Translation is in the public domain.