Sheikh Saalih bin Fawzaan al-Fawzaan mentioned, "The people of knowledge have mentioned that the Quran is explained by one of (the following four ways or methods اربعة اوجه ) Firstly, the Quran is explained by the Quran itself (meaning verses are explained in the Quran by other verses) Secondly, the Quran explained by the sunnah of the prophet (صلى الله عليه و سلم )because Allaah ordered the Messenger to clarify (the meaning of the Quran) to the people, so the sunnah of the prophet explains the Quran. Thirdly, explaining the Quran by the statements of the Companions of the Prophet as they took directly from him and learned from him (the meaning of the Quran). Fourthly, explanation of the Quran by the statements of the followers التابعون (students) of the Companions, as they took (knowledge of the Quran) from the Companions of the Prophet and they learned from them. Fifthly, explanation of the Quran by the Arabic language in which the Quran was sent down in, As Allaah sent down the Quran in a clear arabic tongue (speech لسانا عربيا مبينا ) So if the explanations are not found in the Quran, Sunnah, statements of the Companion or their followers then we return to the Arabic language in which the Quran was revealed. This is the method in which the Quran is explained and not in any other way, like from (making something up/guessing تخرص )and speaking about Allaah without knowledge, as the prophet (صلي الله عليه وسلم) said "whoever speaks from his opinion regarding the Quran and with what he does not know then let him take his seat in the fire." Even if he is correct or incorrect, because he did not take the proper method of explaining the Quran."