What do you mean it never rains but it pours last night, and happiness continues until now?

"It never rains but it pours last night, but today it rains but it pours" comes from a couplet story:

Wang Xizhi, a calligrapher in the Eastern Jin Dynasty, moved from his hometown to Shaoxing, Zhejiang. At this time, it was the end of the year, and Wang Xizhi wrote a pair of Spring Festival couplets for his family and posted them on both sides of the gate. The couplet is: "Spring breeze, spring rain, spring scenery, New Year, New Year's new scene." Unexpectedly, because Wang Xizhi's calligraphy was the best in the world, he was highly respected by people at that time. As soon as this couplet was posted, it was uncovered at night. After the family told Wang Xizhi, Wang Xizhi was not angry, so he picked up a pen and wrote a pair for his family to post again. This pair reads: "Ti Ying Beili, the southern suburb of Yanyu." Who knows, at dawn, it was uncovered again.

But this day is already New Year's Eve, and the next day is New Year's Day. Seeing that Spring Festival couplets are posted in front of every household in the neighborhood, but there is no one in front of my house, Mrs. Wang is anxious to urge her husband to find a way. Wang Xizhi thought for a moment, smiled and wrote another pair. After writing, he asked his family to cut out a couplet and put the first half on the door: "It never rains but it pours." Sure enough, someone stole it at night. But in the moonlight, I can see that this couplet is unlucky. Although Wang Xizhi is a famous calligrapher, he can't post this couplet full of dangerous predictions. The thief had to sigh and slip away in the dark.

At dawn on the first day, Wang Xizhi personally went out yesterday to post a half-cut. At this time, many people are watching. When you look at it, the couplet becomes "Happiness never comes to this day, but it never rains but it pours last night." When everyone saw it, they cheered in unison and applauded.

It used to mean that several good things could not happen at the same time. Today means that you must have several good things happen today. It never rains but it pours. Yesterday's trip meant that all the bad things were over. The meaning of blessing is obvious.