I heard that the wind and rain makes wood material stronger, just like forging a katana. Even if the roots are cut, it'll continue living in its newly changed form. Exposed to the wind and rain, it becomes even stronger. It seems that in Japan, many things used upon finding their essence.
Humans are the same, like polishing a jewel, difficulties polish a person's character. The trials we are given are proportional to our strength, otherwise, we wouldn't be using our true power and then we wouldn't be able to grow stronger. If the polishing machine is built wrong, then it can't polish jewels right? Same goes with us, if the thing that's polishing us is not right, then we won't be polished to become a stronger and better version of ourselves.
If a trial is equal to our strength, then it's okay if we come into an impasse. If we do end up at an impasse, then it just means we're trying to move forward and we want to win. That's why we have to keep trying.