" In the tough times, don’t be surprised if you feel that spirit of heaviness trying to overtake you. Don’t be surprised if you hear those thoughts telling you, It will never work. You’ll never get well. It’s over. It’s done. Don’t believe those lies. You don’t have to be guided by your emotions. They’re not in charge. Instead of letting your negative emotions talk to you, talk to yourself.
When you wake up in the morning and that negative thought comes to your mind saying, It’s a lousy day, don’t just agree and say, “Yeah. It’s a lousy day, I feel terrible.” Instead, turn it around and talk to yourself. Make a declaration of faith out loud: “This will be a great day. I will get well. God will restore health to me. "

― Joel Osteen , Every Day a Friday: How to Be Happier 7 Days a Week