Answer:
The question has words which have what I would call (for want of knowledge of a better description) reflective meanings; The words 'nothing' and 'impossible' cannot stand on their own and owe their existence (valid or otherwise) to the words 'thing' and 'possible'.
If it were true (as it must, in my opinion be) that all things are possible, it follows that nothing is impossible - but there is no validity in the examination of the validity of the statement 'nothing is impossible' - it simply follows from 'everything is possible'. There is no room to (validly) proceed. Says who? Says I! So are you God? Not yet! (remember I said everything is possible) - Have a good day!