Genesis 6:3 The Lord said, “My Spirit will not contend with humans forever, for they are mortal, their days will be a hundred and twenty years.”
When God said that, He gave mankind 120 years to repent of their evil deeds. After that, He intended to contend with the people in Noah’s days no more. He spoke to Noah and Noah began building the ark. While he was doing this, he was witnessing and preaching to people, telling them to repent. In 2 Peter 2:5 Noah was called a “herald or preacher of righteousness”. He warned the people but the people did not listen. In Genesis 6:6, 7 God had had enough. He decided to destroy everyone but Noah and his family.
God’s Spirit contends with men today: giving light to a darkened mind, showing them their sinful nature, stirring their conscience, leading them to faith in Jesus as their Savior and Lord and to repentance from sin to faith. One day, the Spirit will contend with man no longer. He will go with the church in the rapture and then the tribulation will come. Please if you haven’t seen your sin and taken the free gift of grace from God through Jesus Christ, do so. The day will come when it will not be that easy to come to the Lord anymore. The world is turning into the world of Noah, where “every intention of the thoughts of men’s hearts are only evil continually”. You don’t want to be trapped in that kind of world. Acknowledge your sin and come to Jesus. Accept Him as your Savior and Lord.