Parting is all we know of heaven and all we need of hell.

Everything that is right or reasonable pleads for separation. The blood of the slain, the weeping voice of nature cries, 'tis time to part.

Parting is all we know of Heaven,
and all we need of Hell.

Separate we come and separate we go, And this, be it known, is all that we know.

For the present we have journeyed far enough together, and it is time to part.

Every thing that is right or natural pleads for separation. The blood of the slain, the weeping voice of nature cries, 'tis time to part.

[T]he only real parting is when there is no love left to part from.

Ae fond kiss, and then we sever; Ae farewell, alas, forever!

Since there's no help, come let us kiss and part.

Because we are separated everything separates us, even our efforts to join each other.

Parting is all we know of heaven
And all we need of hell

The reason it hurts so much to separate is because our souls are connected. Maybe they always have been and will be. Maybe we've lived a thousand lives before this one and in each of them we've found each other. And maybe each time, we've been forced apart for the same reasons. That means that this goodbye is both a goodbye for the past ten thousand years and a prelude to what will come.

The only real parting is when there is no love left to part from

So, so, break off this last lamenting kiss, Which sucks two souls, and vapors both away.