If one repeats Buddha's four noble truths, the following can be summarised: 1. Life means suffering. 2. The origin of suffering is attachment. 3. The cessation of suffering is attainable. 4. The path to the cessation of suffering. Now, if the origin of the suffering is attachment, this always is not correct. Because people born with a birth defect shall suffer forever. Say he, or she is a deaf person, or a blind person, or having no legs or no hands etc. This person did not have any attachment to cause this sort of a suffering. This is what I am trying to indicate. Buddha was a humanbeing and he must have been mistaken too. No one is perfect. If you believe that Sakyamuni Buddha was a perfect person. That might be your belief but, it can't be factual.