what is the central idea of the poem dust of snow

The central idea of the poem "Dust of Snow" by Robert Frost is that even a small good thing can change ones mood and make a bad day better. The poem describes a moment when the poet is upset and walking in the snow, and a crow shakes some snow from a hemlock tree onto him. This small action changes his mood and saves some part of a day he had rued. The poem suggests that one should hope for the best even in the worst situations and enjoy the simple moments of life to get rid of day-to-day problems and worries.