In the poem "Ode to the West Wind", Shelley's idealism gets reflected in the poem. How?

Shelley's idealism is reflected especially in the 4th and 5th cantos of his "Ode to the West Wind."

Canto 4 is an earnest plea by Shelley to the west wind to infuse him with its raw power and liberate him from the bout of depression which has temporarily overwhelmed him - most probably caused by the death of his son William in 1819. Shelley tells the west wind that when he was a boy he was also as "uncontrollable" as the west wind is now, and he would have easily matched the west wind in its speed. But now, he is depressed and weighed down by the cares and anxieties of life and prays to the west wind to liberate him. He pleads with the west wind that just like how it lifts up the leaves on the earth and the clouds on the sky and the waves on the sea it should free him also from the "thorns of life" on which he has fallen.

In Canto 5, Shelley the poet directly and explicitly asks the west wind to make him an instrument and tool of political and moral change: "make me thy lyre" and "drive my dead thoughts over the universe." The poem ends optimistically with Shelley echoing the popular saying "if Winter comes can Spring be far behind?"