One of the ancient ethical problems in regard to psychology of ethics which is dealt by ethical philosophers has been analysis of “conscious ethical error”. Does human possibly commit ethical errors consciously and deliberately? If yes, what factor this documented event is upon? Two cognitive and non-cognitive approaches have been formed to answer this question. According to the first approach, the possibility of committing conscious ethical error is ruled out and it is believed that ethical error is always attributed to ignorance and lack of knowledge. Giving a positive answer to the possibility of occurrence of this phenomenon, the second approach searches for its roots within both cognitive and non-cognitive layers in human free will system and it considers that the root of occurrence of ethical error is related to incorrect knowledge. Historically, the first person who proposed the first approach was Plato (the one who fixed Socrates’ viewpoint) and the first person who proposed the second viewpoint was Aristotle. This paper is dealt with explaining these two approaches toward the Holy Quran and they are judged based on Quranic teachings. The author has found no verses supporting the first approach while 7 groups of the verses were found which confirm the second approach in that cleavage of viewpoint from action and ethical weakness is possible and realizable and has introduced various non-cognitive roots for it