Believers in Jesus Christ will not achieve sinless perfection in this life. but they should expect changed lives and faith which overcomes the world.
And to him was given dominion and glory and a kingdom, that all peoples, nations, and languages should serve him; his dominion is an everlasting dominion, which shall not pass away, and his kingdom one that shall not be destroyed. Daniel 7:14
For this is the love of God, that we keep his commandments. And his commandments are not burdensome. For everyone who has been born of God overcomes the world. And this is the victory that has overcome the world—our faith. Who is it that overcomes the world except the one who believes that Jesus is the Son of God? First John 5:3-5
Daniel recorded here his visions of what was to come. He found them troubling because they were not easy to understand. We have the advantage of history and can draw some lines between the things he saw and what later occurred. The vision of the beasts seems to refer to the kingdoms of Nebuchadnezzar (Babylonia), Medo Persia, and Alexander the Great. The fourth is not so clear, but some believe it to be the Roman Empire.
What was clear was that none of these kingdoms would endure. The Ancient of Days gives the everlasting kingdom to the son of man, which points to Jesus Christ. His kingdom will not pass away.
John the Apostle knew the Son of Man, his and our Lord Jesus Christ. John wrote that He was the propitiation for our sins (First John 2:2; 4:10). In Him we are given light and have fellowship with God and with all His people who also walk in the light with God (First John 1:7). This fellowship with God results in a changed life. This changed life includes: faith in Jesus Christ, love for God, and obedience to His commandments. Those changes demonstrate a new birth and results in victory over the world.
Think about it
Should we settle for a hum-drum spiritual life? No. Not according to John. We should expect substantial changes. No, not sinless perfection. We will always be going to Him to confess our sins and to be cleansed (First John 1:9). If you do not see evidence in yourself of a new birth, call upon Him for mercy and grace to grant you overcoming faith.