"The light boat has passed the Ten Thousand Mountains" and "It was once difficult to move the sea" are both poems from the Tang Dynasty poet Li Bai.
"The light boat has passed the Ten Thousand Mountains" means: The light boat has already passed the Ten Thousand Mountains. Crossing many mountains means that you have overcome many difficulties and successfully completed a journey.
"It was once difficult to change the sea" means: the hardships and setbacks that have been experienced make people stronger and make them stronger. The sea has become insignificant. It means that after experiencing enough setbacks and hardships, the difficulties faced have become insignificant, which means that one has grown into a stronger person.
These two verses express. At different stages and experiences in life, after experiencing many setbacks and tribulations, people will become stronger and braver, and become more calm and confident when facing difficulties that once seemed insurmountable.