`Aisha, may Allah be pleased with her, narrated that The Prophet, may the peace and blessings of Allah be upon him, said, " follow a middle course (in worship); if you can't do this, do something near to it, and receive good news because one's good deeds will not make him enter Paradise." They asked, "Even you, O Allah's Messenger , may the peace and blessings of Allah be upon him,?" He said, "Even I, unless and until Allah bestows His pardon and Mercy on me. Be informed that the dearest of deeds to Allah is that which done regularly even though it is little"
The Prophet, may the peace and blessings of Allah be upon him, used to instruct his companions to follow a middle course in worship so as to apply the verse which means {O you who have believed, fear Allah and speak words of appropriate justice.} Quran (33:70)
Therefore, only the expert in the forms of speech can really bear the testimony, he must be aware of the course of things, changing of the situation, etc. he shall have an urgent desire to realize the truth and invalidate the falsehood. Yet if one can not fulfill these very requirements he shall do his best to reach what is near to that.