CRITICAL APPRECIATION
What the author is trying to imply is that love is in vain if it’s a ‘one-sided’ love. Love is interdependent. There is also a message that the natural world is on the side of love. The thing that Shelly was stressing on was that love and everything about and in it is sweet. But if it’s only a one-sided love or affection, then it would be all worthless. Shelly uses nature mingling with each other (divine thing) to press on that a man and woman should be together, that nature and man are destined to have a pair.