“Struggling with your target thought is like struggling in quicksand. I want you to watch your thoughts. Imagine that they are coming out of your ears on little signs held by marching soldiers. I want you to allow the soldiers to march by in front of you, like a little parade. Do not argue with the signs, or avoid them, or make them go away. Just watch them march by.” (Marcks & Woods, 2005, p. 440)

8 Ways to Get Rid of Unwanted Negative Thoughts — PsyBlog.