"If the tree doesn't move, what will the wind do to me? If the heart is good, the new injury is like yesterday. " How to understand?

My personal opinion ... probably means that as long as you are determined ... and your heart is right ... then no matter what external influences ... it won't have any substantial influence on you ... and won't be influenced by others. ........... is like a thing. If you care too much, you will feel serious, but if you don't care, you will feel nothing.