Matthew 5:30

And if thy right hand causeth thee to stumble, cut it off and cast it from thee: for it is profitable for thee that one of thy members should perish, and not thy whole body go into hell.

This is the same thought as that in Matthew 5:29, repeated in a different figure for the sake of emphasis. Remember that Christ is still speaking of adultery; and the only proper meaning that can attach to these two verses (Matthew 5:29-30) must relate to that subject. It seems plain enough that Christians should strive, at whatever cost, to avoid lustful thoughts. See under Matthew 18:8-9.