What does a loveless person truly understand about a passionate soul or the ecstasy of love? A deep-rooted, old love does not break today because of a loveless heart.

This couplet beautifully says that a person who has never truly loved cannot understand the intoxicating joy of a deep connection, much like a sober person doesn't grasp the feeling of being tipsy. It further emphasizes that a long-standing, true love is incredibly resilient. Such a profound bond isn't easily broken by mere indifference or the absence of new passion. It speaks to the enduring strength and unique understanding found only within deep, heartfelt affection, which superficiality simply cannot touch or diminish.