This sentence came from Tagore's "Birds", meaning that if you feel sad because you lose the sun, you will also miss the stars. It was a metaphor for people who often feel lost and sad because of the difficulties or losses in front of them, but often ignore the more beautiful and opportunities in life. The meaning of this sentence is that we should not lose confidence because of the difficulties or losses in front of us. We should see more beauty and opportunities in life. When we lose something important, such as love, friendship, career, etc., we may feel lost and sad, but we should understand that this is only a small part of life. We still have many other beautiful opportunities waiting for us to discover and enjoy. Therefore, this sentence tells us not to be swayed by the difficulties or losses in front of us. We must maintain an optimistic and positive attitude to discover and cherish the more beautiful things in life.