The Qur'an is the word of Allah; a direct message from Allah to us His creation and Allah chose the Arabic language as the language of this message. Indeed Allah tells us this in the Qur'an emphasising to us that to understand the message in its fuller form one must understand the language:
"Indeed we have sent it down as an Arabic Qur'an, in order that you may understand" (Surah 12:2)
The Arabic language has without doubt served as a very effective medium for the communication of the message of Islam. A transliteration of the Qur'an, even an excellent one with extensive commentary, cannot replace the original text revealed and preserved by Allah Ta'ala Himself. This is because so much of the potency and splendour of the words and their meanings which are inextricably linked to the Arabic language are lost in English or any other language. Indeed to appreciate the poetic beauty of the Qur'an one needs to have an understanding of Arabic. May Allah Ta'ala give us the ability to understand the Qur'an with its correct meanings, ameen.