What is the theme of poem DUST of SNOW ?

The theme of the poem is very significant because it tells us how to take the opportunities that come our way without wasting time brooding over the past. Sometimes we face failure but if we brood over it and become upset, then we waste valuable time that could be used in preparation for our next test. The poet had been sitting under a hemlock tree wasting a lovely day because he was upset about something, but when a crow shook some dust of snow on him, he felt happy again and looked at things in a new light.