There is a saying in "Birds"

Tagore, an oriental poet, said, "If you shed tears when you lose the sun, you also lose the stars." This seemingly simple but actually profound philosophical saying taught us the connection between loss and gain, and built a bridge for us to turn disappointment into hope and pain into happiness. It made us understand that gain is a kind of happiness, and loss ...

After the sun goes down, night comes.

The philosophy is that if a person indulges in the grief of loss too much, then that person will never get it again.

Don't just be sad about what you have lost in front of you and ignore other scenery around you. Don't lose big because of small things.

It probably means focusing on the overall situation. It is normal to lose something in order to do great things. The sun is only a member of the vast universe. We should not just look at the sun, but more stars that are bigger and brighter than the sun.