In Mathew 5:29-30, Jesus, in discussing a particular sin (in this case sexual lust), goes on to give the remedy in verses 29 and 30.
vs. 29 "And if your right eye causes you to sin, pluck it out and cast it from you; for it is more profitable for you that one of your members perish, than for your whole body to be cast into hell."
vs. 30 "And if your right hand causes you to sin, cut it off and cast it from you, for it is more profitable for you that one of your members perish, than for your whole body to be cast into hell."
Now I don't think Jesus is going around advising people to saw off their own limbs or gourge out their eyeballs, but it clearly makes the point that He is calling for some drastic action that will put an end to sin and it's ultimate takeover and destruction of our lives.
Our eyes ( or inward perception) will cause us to respond to life's stimuli in a particular way. In the example Jesus gave of a man who lusted in his heart after women that he looked upon, thus committing the sin of adultery in his heart, the remedy was to "pluck it (his eye) out"..... show no mercy,.... get rid of that perception (seeing) of women that is behind this sin......seeing them first and foremost as objects for his own personal use and satisfaction rather than what they are.....fellow creatures like himself with hopes, dreams, unique personality, heirs of life just like him.
The first step, of course is to admit that we have such a perception and that we need the cleansing power of the blood to wash the mind of it's defilement so that we can come to a place of abhorrence (repentance) of such perception and "pluck it out".
This is a kingdom principle and can be applied to any problem of sin in our life. Jesus is warning us that sin.... any sin, left alone to fester, can grow to the point of making our life hell on earth. How many christians have started out just occasionally indulging such a sin as Jesus mentioned in these verses, and ended up addicted to porn or worse. Our life doesn't have to descend into hell if we will heed the Master's admonition and "pluck it out".