"That's the wise thrush; he sings each song twice over, lest you should think he never could recapture the first fine careless rapture!"

In this quote, Robert Browning is explaining the behavior of a thrush, a kind of bird known for its gorgeous singing. The thrush is referred to as "smart" due to the fact that it has a special habit of singing each tune twice. This repetition might seem unnecessary, but the thrush does it to make sure that the listener fully experiences the appeal and happiness of its tune. By singing the same tune twice, the thrush is able to regain the initial feeling of carefree pleasure that inspired its song in the very first location. This quote serves as a suggestion to value and savor the simple satisfaction in life, just like the wise thrush does with its song.