Matthew 6:24
No person can serve two masters, for he will either hate the one and love the other, or else he will cling to the one and look down on the other. You cannot serve God and material things [at the same time].
Matthew 26:52
Then Jesus said to him, "Put your sword back in your belt again, for all those who use the sword will die by the sword.
Romans 2:4
Or, do you despise the abundance of God's kindness and tolerance and patience [toward you], not realizing that His kindness is intended to cause you to repent? [i.e., to change your hearts and lives].
1 Thessalonians 4:8
So, the person who rejects [this exhortation] is not [merely] rejecting what man says but God [Himself], who gives His Holy Spirit to you.