What is the meaning of this quote 'love sought is good but given unsought is better'?

It means that if you have to ask someone to love you, or for affection, then that love or affection is good, but that if someone gives you love or affection without you having to ask for it, then it is much better.

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It's a lot better to have someone fall in love with you for who you are and not because you've been trying to woo them.

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It can also mean love is good when you have been trying to find it, and you do. But when it comes to you without you looking for it, it is even better.