The famous saying is:

1. The right road is not necessarily a smooth straight road. It will inevitably have some twists and turns, rugged obstacles, detours, and even go astray. Tell your brother not to complain, to overcome difficulties and setbacks, and to face them bravely. He expressed the hope that his brother would not be discouraged. Face it bravely.

2. Don’t complain when you encounter difficulties. Since you can’t change the past, try to change the future. He expressed the hope that his brother would have hope for the future, come on, and move forward bravely.