Furthermore, no one is guided by divine revelation after the termination of the institution of Prophethood with the departure of Muhammad (sws) and it is his or her judgement which must be exercised. Therefore, no one can be certain whether he has attained the absolute truth or not. He must keep his eyes and ears open to criticism and cling to whatever he thinks to be the truth till he has reason to abandon it and accept a new premise as truth. Moreover, in adopting or forming an opinion in religious matters, the real thing is sincerity of judgement. As long as a person is sincere in exercising his judgement, it does not matter what conclusion is reached. As the Prophet of Allah has put it: a person who strives to form an opinion can reach the right conclusion and he can also reach the wrong one; if he reaches the right conclusion he will be rewarded twice in magnitude and if he is lead to the wrong conclusion he shall still be rewarded though of single magnitude. This shows that the real thing in this regard is the sincerity of effort put in.