I don't always believe what a therapist says. In fact, generally, my beliefs are so set in stone (especially when completely irrational) that it takes years of therapy for me to break down those walls of irrational belief so I can finally discover the truth about myself. Notice, nowhere in there did I say I take what my T says about me as truth just because he says it. What I do though is perhaps take it under consideration, very tentatively, and using my own faculties, put up my beliefs against his over time and make my own decision about it in the end.