Voices and ideas that pop up inside your head are not always you. You need to make this distinction very clearly.
Thoughts and voices in the mind can come from anywhere and they should not be listened to, but rather dictated to.
The planes can fly overhead, but you do not have to let them land in your head. Tell the bad thoughts and ideas to keep moving and focus on something else.
The birds can land in your hair, but do not let them make a nest... Shoo them away, tell the voices to be silent, tell them no, tell them that this is your mind and you dictate what stays and what goes.
Choose to banish negative thoughts, evil thoughts, selfish thoughts, harmful thoughts, unloving thoughts, ungodly thoughts.
Keep and cling tightly to good thoughts, happy thoughts, heavenly thoughts, loving thoughts, kind thoughts, thoughts of Lord Jesus and God our Father and the Holy Spirit who is with us and in us always.
Our bodies are the Temple of God, where He has chosen to reside, to stay.
This means that our mind is the alter where what we focus on is the thing we are choosing to worship.
Attention is worship. Choose God, choose good, focus on love, for God is love. (1 John 4:7-8)
If the birds are making nests and you let them stay there, they will own your head and make it home forever.
Command the voices to be silent if they are negative, evil, or unloving.
Do not believe anything that tells you that you must obey it. It is lying to you.
If a voice disagrees with scripture in the Bible, it is not from God. (1 John 4:1)
Speak control into your mind with your physical voice if you need to. Choose something good to change your focus to and begin talking about it out loud and thanking God for good things. If voices contradict you and try to distract you, disregard them and affirm that you will stay focused on positive things only and that this is your choice that you are dictating. (Philippians 4:8) (Proverbs 18:21)
Practice makes things easier, giving up makes things harder. Willpower is a muscle and we must use it, or we lose it.
This is easier said than done. But it is absolutely achievable, for with God's help we can do all things. (Philippians 4:13)
Do a search for positive quotes, leadership quotes, Bible quotes, optimism quotes. Dig in deep into positivity and the Bible.
God told us this is a war, and it is a war that starts inside our minds. The enemy wants to destroy us, and that is where he starts, attacking our mind.
We must fight evil, and choose good, resist Satan and choose God the Son, Lord Jesus. (James 4:7) (Joshua 24:15)
Memorize scriptures, including these posted here. Work hard at it, and they will guide you every day. Make sure you can say them without looking at them or reading them. They are the "good" thoughts we need to keep us on the path of light and truth and to win the war in our mind.
Jesus Christ, God the Son, died for you and me and all who would accept His love. Focus on this love, remember this love, embrace and immerse your mind in this love and become this love. He loves you more than anyone else could, and wants to teach us how to be the same kind of love that He is in our thoughts and deeds. (John 15:13) (1 Corinthians 13:13) (1 Timothy 1:5) (Matthew 27)