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I did not find information related to below saying. Please help me to understand same.

"All who joy would win must share it, Happiness was born a twin"
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I suppose it means that in order to be happy you need to share happiness with someone else.
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Here's a bit more:

Don Juan, Canto II, Stanza CLXXII.

Both were so young, and one so innocent,
That bathing passed for nothing; Juan seemed
To her, as 't were, the kind of being sent,
Of whom these two years she had nightly dreamed,
A something to be loved, a creature meant
To be her happiness, and whom she deemed
To render happy; all who joy would win
Must share it,--Happiness was born a Twin.
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Comments  
Happiness was born a twin means you will feel happiness twice. Once when you actually feel it and second when you share it with someone else.

Is my understanding correct?
sachin patelHappiness was born a twin means you will feel happiness twice. Once when you actually feel it and second when you share it with someone else.Is my understanding correct?
I am not sure whether it means that, or whether it means that happiness "comes in pairs", i.e. it needs two people to be happy together.
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 Mister Micawber's reply was promoted to an answer.

When something good happens in your life you are so elated, filled with joy and happiness, naturally you want to share it with another...

I think he is trying to describe a form of love, and as such, that you would need a relationship with another person to experience it and share the joy. In a way saying that you cannot produce that happiness by yourself?

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anonymousI think he is trying to describe a form of love, and as such, that you would need a relationship with another person to experience it and share the joy. In a way saying that you cannot produce that happiness by yourself?

The writer is better than either of us, or even anybody on this website. If we can't understand what he means, no amount of guessing and paraphrasing will help. It is his thought, his creation. He has already expressed it as well as it could ever be expressed. The trick is to read well.