To understand a principle includes understanding the thinking of the Lawgiver and the reasons why he gave certain laws.
وَمَبَادِئُ يَهْوَهَ تُسَاعِدُنَا أَنْ نَفْهَمَ كَيْفَ يُفَكِّرُ وَلِمَ وَضَعَ شَرَائِعَ مُعَيَّنَةً .‏