What does the Loss of Paradise (or the Fall) mean in Robert Frost's poems "After Apple-Picking," "The Oven Bird," and "Fire and Ice"?

What does the Loss of Paradise (or the Fall) mean in Robert Frost's poems "After Apple-Picking," "The Oven Bird," and "Fire and Ice"? I've re-read them multiple times but still don't understand the meaning of the question or the poems.