What did Tagore's classic quote," The sky leaves no trace of birds, but I have flown " mean?

This classic quote came from Tagore's "Birds", which originally read,"There are no traces of birds in the sky, but I have flown." What it means is that even if I didn't leave behind any actual actions or traces, I've already lived through this period of time, experienced the beauty and challenges of life, and these experiences have become my precious wealth. This sentence expressed Tagore's love and pursuit of life. He believed that life should be like a bird flying freely in the air, leaving its own traces while enjoying the joy and meaning of life.