Robert J. Wicks said this quote

Critical thinking helps us to more clearly understand situations, patients, colleagues, and our agendas, negative emotions, attitudes, motivations, talents, and growing edges. This not only helps us to have a greater grasp of reality but also stops the drain of psychological energy that is necessary to be defensive or to protect our image. Because critical thinking is not natural, although we may think it is for us, it takes discipline, a willingness to face the unpleasant, and a stamina that allows one not to become unduly frustrated when we do not achieve results as quickly as we prefer with respect to our insights and growth.

~ Robert J. Wicks