If you want to dismiss a negative thought, the only way to do so is to think of something positive and constructive.
Emmet FoxYou must pray for yourself constantly. How could it be otherwise? We worship God by believing in Him, trusting Him, and loving Him wholeheartedly - and we can attain to that only through prayer. The sole object of our being here is that we may grow like Him - and we can do that only through prayer. The more we pray for ourselves the more power will our prayers have for any other purpose whatever; so praying for ourselves is the reverse of selfishness - it is truly glorifying God.
Emmet FoxYou are not happy because you are well. You are well because you are happy. You are not depressed because trouble has come to you, but trouble has come to you because you are depressed. You can change your thoughts and feelings, and then the outer things will come to correspond, and indeed there is no other way of working.
Emmet Fox