The document discusses the perseverance of birds when faced with adversity. It notes that birds will spend days building their nests, only to have them destroyed by weather, humans, or other animals. However, the birds do not give up - they start rebuilding their nests until they can finally lay eggs. Even if the nest is destroyed again when eggs or chicks are present, the birds still do not stop singing or building. The document encourages the reader to show the same perseverance when faced with challenges in life, and to keep rebuilding after setbacks instead of giving up.