Envelope rhyme is the third and final basic pattern. Like something almost being said. The recent buds relax and spread, Their greenness is a kind of grief. No, they die too. Their yearly trick of looking new Is written down in rings of grain.
Last year is dead, they seem to say, Begin afresh, afresh, afresh.
Customarily, this pattern is established at the beginning of a poem and repeats thereafter for as long as the poem continues. The stanzas are, in other words, structurally identical. It yet remains to see If immortality unveil A third event to me. So huge, so hopeless, to conceive As these that twice befell. Parting is all we know of heaven, And all we need of hell.