;cognitive therapists believe that if clients change their they will be able to change their feelings, behaviors, and symptoms.

The answer is Thoughts
Cognitive therapist believe that the emotion that we felt in our day to day live willl heavily influenced by the way we see/perceive everything that happen around us.
For example, people who percive failure as a challenge to get better would tend to feel excited and motivated to work harder after the failure. People who percieve failure as a final nail in the coffin will tend to lower their performance after hitting a failure.

Answer/// absolute and unchanging laws;