(1) Source This is a famous saying in A Chinese Odyssey, and this line can only be described as "popular" in the present situation.
(2) There is no fire mountain that can't be crossed, that is, there is no hurdle that can't be crossed. In the end, everything can be solved. It can be career, study, love, life and so on.
3 The Flame Mountain is a metaphor for the difficulties encountered in life. There is no mountain of fire that can't be crossed, which means that the difficulties in life will eventually be overcome than us.