If a person is casual about their sin, they are in danger. Jesus Christ looked men directly in the eye and warned them that they will be thrown into hell unless they cut off occasions that cause sin. Many professing Christians will soften a warning like this under the pretense of "grace", but they misunderstand what grace produces in someone's life. If a person is saved by grace and justified by faith, they will take the warnings of Christ seriously and not dismiss them. We must fight or go to hell.