It is possible that we relied on him in this by designation and we believed him because it is based on evidence and theoretical knowledge, so he knew of his truthfulness, so our calmness and not being disturbed when we lose the reasons is due to our belief in his guarantee. If we remained with knowledge, we would be disturbed. If the knower is calm, then it is from the fact that he is a believer, and his being a believer is from the fact that he knows about the truthfulness of the guarantor. < /p >