Poem editing

Love's Philosophy

by Percy Bysshe Shelley

The fountains mingle with the river
And the rivers with the ocean,
The winds of Heaven mix for ever
With a sweet emotion;
Nothing in the world is single,
All things by a law divine
In one spirit meet and mingle -
Why not I with thine?

See the mountains kiss high Heaven
And the waves clasp one another;
No sister-flower would be forgiven
If it disdained its brother;
And the sunlight clasps the earth,
And the moonbeams kiss the sea -
What are all these kissings worth

If you kiss not me?

The moment of change is the last sentence "If you kiss not me?" 

The write tries to explain "love's philosophy" through using examples of nature. "The fountains mingle with the river and the rivers with the ocean, the winds of Heaven mix for ever ,with a sweet emotion;" River, ocean, fountains, winds are all emotional in writer's eyes. They fall in love and everything becomes sweet. "And the sunlight clasps the earth, and the moonbeams kiss the sea -what are all these kissings worth" Sunlight clasps the earth and moonbeams kiss the sea, they all love selflessly. That is love, to devote, to do things for lover, to love selflessly, just like the nature. 

The last sentence "If you kiss not me?" The poet makes the change. The poet lists sunlight clasps the earth and moonbeams kiss the sea, the river and ocean, fountains and winds are all in a sweet emotion, everything in nature is fall in love. The philosophy of love is simple — to stay with your lover. So the last sentence "If you kiss not me?" means: you should kiss me.