You can think your way into suffering in an instant; however you can't think your way out.
How easy it is to have the words of others take hold in ones mind. Those words, or what ever 'it' is, can remain for hours, days, months or even years. Now lodging firmly in the mind, what is to be done?
People will sometimes speak of something that has been bothering them, and for some considerable time. By just spreading out what's there and letting light and air in and around can be just what helps the lodger to leave. Or at lease start to loose interesting in staying. This is essentially an internal practice, requiring courage and compassion. And the long view.