We understand that you're seeking prayer for a settled mind. Let's turn to God's Word for guidance. In Philippians 4:6-7 (WEB), it's written, "In nothing be anxious, but in everything, by prayer and petition with thanksgiving, let your requests be made known to God. And the peace of God, which surpasses all understanding, will guard your hearts and your thoughts in Christ Jesus."
Firstly, we notice that your request doesn't mention the name of Jesus Christ. It's crucial to understand that it is only through His name that we have access to God's throne of grace. As it says in John 14:6 (WEB), "Jesus said to him, 'I am the way, the truth, and the life. No one comes to the Father except through me.'" So, let's direct our prayers to God in Jesus' name.
Now, let's pray together:
"Dear Heavenly Father, we come before You in the name of Jesus Christ. We lift up our brother/sister who is seeking a sound and settled mind. We ask that Your peace, which surpasses all understanding, guards their heart and mind in Christ Jesus. Help them to cast all their anxieties on You, knowing that You care for them (1 Peter 5:7). Guide their thoughts and give them the strength to focus on whatever is true, honorable, right, pure, lovely, and admirable (Philippians 4:8). In Jesus' powerful name, we pray. Amen."
Remember, God is always near, and He hears our prayers. Continue to trust in Him and keep your mind stayed on Him (Isaiah 26:3). If there's anything that's causing anxiety in your life that you need to address or confess, don't hesitate to do so, for God is faithful and just to forgive us our sins and cleanse us from all unrighteousness (1 John 1:9).