We do not interpret the Qur’an in the same way it is interpreted by those who falsely interpret the verses concerning the sword and fighting. They wrongfully claim that these verses call for every Muslim to kill the non-Muslims.
Since even the Hadith has to be linked to other Hadith when we want to explain it, what more the Book of Allah U? Thus, the Holy Qur’an is interpreted firstly through the Qur’an itself.
For example, when Allah U says:
﴾وَإِذْ قُلْنَا لِلْمَلائِكَةِ اسْجُدُوا لآدَمَ فَسَجَدُوا إِلاَّ إِبْلِيسَ أَبَى وَاسْتَكْبَرَ وَكَانَ مِنْ الْكَافِرِينَ﴿
“And [mention] when We said to the angels, ‘Prostrate before Adam’; so they prostrated, except for Iblees. He refused and was arrogant and became of the disbelievers.” [Surah Al-Baqarah: 34],
we will not know that Iblis is of the jinn without referring to the verse in Surah Al-Kahf:
﴾فَسَجَدُوا إِلاَّ إِبْلِيسَ كَانَ مِنْ الْجِنِّ فَفَسَقَ عَنْ أَمْرِ رَبِّهِ ﴿
“they prostrated, except for Iblees. He was of the jinn and departed from the command of his Lord” [Surah Al-Kahf: 50].
Therefore, the Mufassir (Interpreter) has to have a grasp of the whole Qur’an. A person who wants to interpret Surah Al-Fatihah cannot do so if he does not know the interpretation of the other Surahs. This is because, many of the verses interpret each other and some verses provide the meanings of some other verses.