Why does the poet believe the poetry of earth is not dead on the poem of the grasshopper and the cricket ?

The poet believes that the poetry of earth is not dead because he hears the grasshopper and the cricket singing in the grass. Their songs are a form of natural poetry that connects the poet to the earth and reminds him of the beauty and vitality of the natural world. The poet finds inspiration and joy in the songs of these creatures, which he sees as evidence that the poetry of earth is still very much alive.