Is there any wisdom behind the fact that the Quran was revealed in Arabic? Why was Arabic chosen?

All perfect praise be to Allah, The Lord of the worlds. I testify that there is none worthy of worship except Allah and that Muhammad is His slave and Messenger. 

From the wisdom behind the revelation of the Quran in the Arabic language is that Arabic is the richest language and that it is the language of the Arabic peninsula, whose people were the first to be addressed by the Quran.

Az-Zarkashi said in Al-Bahr Al-Muheet:

“Allah sent down the Quran in the Arabic language; Allah says: {And We did not send any messenger except [speaking] in the language of his people.} [Quran 14:4] Ibn As-Sam’aani cited a good question, which is that the previous Prophets, may Allah exalt their mention, were sent to their own people, so it is for this reason that they were sent speaking their language. However, our Prophet Muhammad was sent to all nations, but why is it that he was sent with the language of some of them [the Arabs]? The answer is, 'Either he would have been sent with the language of all of them, which would have been unusual and abnormal; rather, this would have been most unlikely, and it is impossible that each word of the Quran be repeated in each language, so it had to be in only one language, and the Arabic language is most deserving of it, as it is the richest and most eloquent one and because it is the most suitable language for the addressees (the Arabs).”

Allah knows best.