"You have heard that it was said to the people long ago, 'You shall not murder, and anyone who murders will be subject to judgment.' But I tell you that anyone who is angry with a brother or sister will be subject to judgment." NIV
"Ye have heard that it was said by them of old time, Thou shalt not kill, and whosoever shall kill shall be in danger of the judgment: But I say unto you, that whosoever is angry with his brother without a cause shall be in danger of the judgment." KJV
We often fail to acknowledge that sin is not just a behavior. If we have not acted on a thought or feeling, then we believe we have not sinned. According to God's Word, more specifically the words of Jesus while He was on earth, even if we think about killing, lusting, etc in our hearts, we have committed the sin. We cannot help thoughts that come into our minds, but we control what we do with them. If we entertain a thought that is contrary to the Word of God, we are sinning just as if we are carrying out the act. If we guard our hearts and minds against temptation, God will give us strength to put it out and keep us from being pulled into sin.
Heavenly Father, we understand that sin begins in our thoughts that we seem to hang on to and entertain. Please give us the strength and maturity to bring all our thoughts captive to Christ so we won't sin against You. In Jesus' name we pray, Amen.