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Doomflower "When Jesus advises us to pluck out a sinful eye or cut off an unruly hand, He is employing a figure of speech known as hyperbole. Hyperbole is an obvious exaggeration or an intentional overstatement. Examples of hyperbole in modern speech would include statements like “This bag of groceries weighs a ton,” “I’ve been waiting forever,” and “Everyone knows that.” The apostle Paul uses hyperbolic language in Galatians 4:15. Hyperbole, like other figures of speech, is not meant to be taken literally.
Jesus’ purpose in saying, hyperbolically, that sinners should pluck out their eyes or cut off their hands is to magnify in His hearers’ minds the heinous nature of sin. Sin is any action or thought that is contrary to the character of God. The result of sin is death, from which Jesus wants to preserve us (see Hebrews 2:9). Jesus warns of hell because He doesn’t want people to go there (Matthew 5:29–30).
Sin takes people to hell (see Revelation 21:8), and that makes sin something to avoid at all costs. Jesus says that, whatever is causing you to sin, take drastic measures to get that thing out of your life. “It is better for you to enter life maimed or crippled than to have two hands or two feet and be thrown into eternal fire. . . . It is better for you to enter life with one eye than to have two eyes and be thrown into the fire of hell” (Matthew 18:8–9). Nothing is worth missing heaven for. Nothing is worth going to hell for. Nothing.
God takes sin seriously—seriously enough to sacrifice His only begotten Son to destroy it. We must take sin seriously as well. A lack of repentance is a crime punishable by eternal death. It is better to deny our flesh—to pluck out an eye or cut off a hand, as it were—than to risk sinning against God. God demands holiness (1 Peter 1:15), but we naturally tend to pamper ourselves and excuse our sin. That is why we need Jesus’ shocking, radical hyperbole to wake us from our spiritual complacency."
-GotQuestions.org