Psalm 37:1 starts with the words 'Fret Not'. Fret means to blaze up, to be angry, be displeased. Another meaning is to vie with a rival, or contend. It can also cause you to worry, or be anxious. Philippians 4:6 (AMPC) says 'Do not fret or have any anxiety about anything, but in every circumstance and in everything, by prayer and petition (definite requests), with thanksgiving, continue to make your wants known to God.' Notice, this verse begins with the words do not fret OR have any anxiety. Why? Studies have shown that if you stay angry, or worried, it will cause high blood pressure, and even respiratory issues. Suppressed anger gets stored in the body as tension. In simple language, it is very unhealthy. We are instructed in the Word, 'be angry and do not sin; do not let the sun go down on your wrath.' (Ephesians 4:26). Staying angry can cause you to lash out with very harmful words, and what has been said cannot be taken back. They can be forgiven, but not retracted, and in some cases, cause some very serious psychological harm to the recipient. But, verse 7 of Philippians 4 (AMPC) says 'And God's peace [shall be yours, that tranquil state of a soul assured of its salvation through Christ, and so fearing nothing from God and being content with its earthly lot of whatever sort that is, that peace] which transcends all understanding shall garrison and mount guard over your hearts and minds in Christ Jesus.' When we go to God in prayer with everything; giving Him thanks for hearing us and seek His wisdom, and not allow the stress, anger, or resentment to take hold, and allow the Holy Spirit to guide us; then His peace just envelopes us, and we know that He has this and that He will get us through whatever we may face. That's what the Word says in Philippians 4:6-7. He will guard our hearts and minds THROUGH Christ Jesus. So, do not fret.