There is no trace of birds in the sky, but I have flown. This means that I have tried, tried, even though I didn't succeed. "The sky has never left traces of birds, but it has flown" is Tagore's famous saying, which comes from Tagore's firefly collection, which is a collection of poems by Tagore, a famous Indian poet. His English name is Fireflies. The poems in the collection mainly praise insects such as "fireflies" and those tiny, stubborn and brave lives, which are still flying in the sky even if they are never appreciated. Longing for light in the dark, we should pay attention to the process and work hard. Even if there are no outstanding achievements, no fame, or even "nothing", then life is valuable, because we have practiced it and have no regrets, and people can't even see their own achievements and struggles. Then, in the future, people will see that time will tell. Some people deliberately pursue fame and fortune and struggle.