So then, dear friends, since you are looking forward to this, make every effort to be found spotless, blameless and at peace with him.
NIV
So, beloved, since you are expecting these things, be eager to be found by Him [at His coming] without spot or blemish and at peace [in serene confidence, free from fears and agitating passions and moral conflicts].
AMP
Wherefore, beloved, seeing that ye look for such things, be diligent that ye may be found of him in peace, without spot, and blameless.
KJV