One of the fine things about good poetry is that it will not only bear study and examination, but will yield new beauty and new pleasure as it is better understood. For instance, take the first stanza above. Lowell says Longfellow's poetry is sweet and easily understood and that one line follows another smoothly. To make us see how smoothly, he makes a beautiful comparison, draws for us an exquisite picture. As smooth, he says, as is our own river Charles when at night, fearing to disturb by so much as a single ripple the reflection of the crescent moon, a mirrored skiff, it glides along noiselessly but whispering gently to the reeds that line its shores.