al-Salāmu ‘alaykum wa rahmatullāh,
If Arabic is a sea, then the Qur'an is the most precious treasures, jewels, pearls and gems that can be found in the sea. But reaching these treasures requires a diver skilled in deep thought and contemplation. One of the prerequisites for a diver to reach this level of skill, is a knowledge and understanding of Arabic and its sciences.
In this regard, Ibn Taymiyyaah (rahimahu Allaah) commented,
"Before one can interpret and understand the Qur'an and the Hadith, he must know the denotations and connotations intended by the words of Allaah and His Messenger (sallaa Allaahu 'alayhi wa sallam). How can their words be understood? Knowledge of the Arabic language in which we were addressed will help us to understand what Allaah and His Messenger (sallaa Allaahu 'alayhi wa sallam) intended through their words, as will understanding the semantics behind the words and phrases. Truly, most of the misguidances of the Innovators occured due to this reason – they began to misinterpret the words of Allaah and His Messenger (sallaa Allaahu 'alayhi wa sallam) claiming that they meant one thing, when really they meant another." 
 al-Eemaan : 111