of reason, in accordance with his primitive nature and special creation, desires to find out about these realities, remove curtains from these mysteries; provide correct answers for these inquiries and many more alike. The human faculty of reason possesses this distinction in it whereby it can distinguish between truth and falsehood and naturally is inclined to discover the realities and causes of things, and until it rests upon an absolute certainty, it does not feel comfortable.

These sorts of topics are called principles of religion (’usul-e-din). The principles of religion are topics which are relevant to the thought and soul of human beings, reason and intellect follow it, and deeds and movement of human beings spring forth from its fountainhead accordingly. In the principles of religion (’usul-e-din) imitation or following is not allowed and everyone is obliged to discover them through his reason and intellect. If a human being, for his beliefs, succeeds in creating a stable and firm groundwork, his intellect and soul feel at ease; he rescues it from internal anxiety, bewilderment, and wandering, and in that case he could continue his life with his conscience at ease and in comfort.