A new tareget

I had thought why I really study English?!
I had said before "because every job needs English and it is the most commonly spoken language"
 It is true but I will be a mathematics teacher in shaa allah so I won't use English so much in my job
So I learn English for the second target ... for understanding other people and saying my opinion
 From many months someone asked me about something in my religion,Although I understood the question and I knew the answer, I couldn't answer him... I couldn't express what I wanted to say...
 What is the importance of studying something if it can't make you able to express your opinion and call to the right,,
so my new target is: I will study English for calling to the right