Arabic
So many years passed by. We don't know how much time we have left. We have one life on Earth. How much effort did we put? Do you know the meaning of “eternity”? Do you truly know? Even if Allah grants me 100 years on Earth, they are very less compared to eternity. Even the people who were granted about 1000 years on Earth in the past during the time of Nuh عليه السلام had a much shorter life on Earth compared to the eternal life of Aakhirah.
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A Muslim who understands Arabic benefits in many ways , بِإِذْنِ الله
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(In no particular order)
You can understand the Qur'an.
You can understand when the Qur'an is being read. So, the Muslim’s khushu' in Salah can increase, بِإِذْنِ الله . Your Taqwa of Allah and Tawakkul on Allah may increase, إن شاء الله .
You can understand the Khutbah in the Masjid. You can understand lessons and books of authentic knowledge in Arabic. الحَمدُ لله
You can understand the Ahadeeth. الحَمدُ لله
It becomes even more easy to do Hifdh of the Qur'an, بِإِذْنِ الله . It becomes more easy to memorize the Ahadeeth, بِإِذْنِ الله
You will know when not to stop and when to stop while reciting the Aayaat of the Qur'an, in shaa' Allah. (The whole meaning may be conveyed differently than the actual meaning if you make a mistake in pausing while reciting, depending on what Aayah you are reciting)
If you know Arabic grammar, you will understand why there is a Fathah in the end of a certain word and why there is a dammah in the end of a word, in shaa' Allah . You will know that if you mispronounce a Fathah to a dammah , the whole meaning can change and it can become a huge mistake on your part. You may say "oh, I didn't know!" The question is "are you trying to gain knowledge?"
If you understand Arabic, it will be a reminder for you every time you understand the Ayaat of the Qur'an being recited and Ahadeeth being narrated, إن شاء الله
The Qur’aan is the Speech of Allah. The Qur’aan is very beautiful. It is in Arabic. Don't you want to understand it? Don't you want to experience the beauty to a much greater level? The One Who Created you sent this Book. Allah chose the Arabic language to be the language of the Qur'an. There is a lot of wisdom in the decisions of Allah.
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إنا أنزلناه قرآنا عربيا لعلكم تعقلون
[Qur'an 12:2]
"Indeed, We have sent it down as an Arabic Qur'an so that you understand."
(--Translation of the meaning of the interpretation)
Don't you want to have a better understanding of the Qur'aan? The Qur'aan is easy to understand. The question is "are you willing to understand?"
ولقد يسرنا القرآن للذكر فهل من مدكر
[Quran 54:22]
"And We have certainly made the Qur'an easy for remembrance, so is there any who will remember?"
(--Translation of the meaning of the interpretation)
كتاب أنزلناه إليك مبارك ليدبروا آياته وليتذكر أولو الألباب
[Qur'an 38:29]
[This is] a mubarak Book which We have revealed to you, that they might reflect upon its Aayaat and that those of understanding would be reminded.
(--Translation of the meaning of the interpretation)