Those who listen to the word but do not do what it says are like people who look at their faces in a mirror
NIV
For if anyone only listens to the Word without obeying it and being a doer of it, he is like a man who looks carefully at his [own] natural face in a mirror
AMP
For if any be a hearer of the word, and not a doer, he is like unto a man beholding his natural face in a glass:
KJV
Let perseverance finish its work so that you may be mature and complete, not lacking anything.
NIV
But let endurance and steadfastness and patience have full play and do a thorough work, so that you may be [people] perfectly and fully developed [with no defects], lacking in nothing.
AMP
But let patience have her perfect work, that ye may be perfect and entire, wanting nothing.
KJV
They are double-minded and unstable in all they do.
NIV
[For being as he is] a man of two minds (hesitating, dubious, irresolute), [he is] unstable and unreliable and uncertain about everything [he thinks, feels, decides].
AMP
A double minded man is unstable in all his ways.
KJV