For some reason, we still have gnats in winter. I think they live in the house plants and fly across my line of vision. I notice them when I'm reading. Sometimes I ignore them, more often I try to swat them. I stop reading and "slap and slide." It's the only way I'm guaranteed they won't slip through my hands.
Negative thoughts come to be from left field too. I can ignore them hoping they'll go away but, like gnats, they'll often circle and come back to annoy me.
But, I'm learning to SWIT them. SWIT is an acrostic my husband and I have started using: "Speak What Is True."
Truth always sets us free. Sometimes I need courage or information to SWIT it, but as I ask people who love me to give me more objective input, I can gain a better perspective on my situation. Sometimes, there is only One who loves me AND has the perspective to help me SWIT it. So I ask for help.