The quote conveys a sense of finality in sadness. "No sequel to the sadness" signifies an end or closure. The quote implies that the sadness being experienced is so profound that it doesn't lead to any further similar emotions or events.
The quote underscores the depth of the current sadness. It emphasizes that the emotional pain is so intense that it feels like a conclusive experience, with no follow-up or continuation of that same level of sadness.
In essence, the quote speaks to the overwhelming nature of the current sadness. It reflects the belief that the depth of this emotion is unparalleled and that there won't be any further instances or events that can match or surpass it in terms of sadness.