We cannot always control our thoughts, but we can control our words, and repetition impresses the subconscious, and we are then master of the situation.
I think it's still hard for me to turn down work if it's really good because for so many years I was so desperate to get a job and couldn't and so it's kind of an anathema for me to turn down work.
In the United States today, we have more than our share of the nattering nabobs of negativism.

