It is a blessing not a curse.
It's a blessing not a curse, it's a curse that can't be avoided, a proverb, meaning that the disaster that should be suffered can't be avoided.
Source:
Ji Gong Quan Zhuan, 176: It is better to muddle them away with words, really not, that can not speak. It is a blessing, not a curse, but a curse that can't be avoided. It means that fortune and misfortune are predestined, and when fortune comes, it can't be blocked, and when calamity comes, it can't be avoided. What should come will come eventually, and when it doesn't come, it won't come after all. Therefore, we should face it openly. Depending on the context, it can be used to express one's open-mindedness and let nature take its course, or it can be used to reassure others not to worry too much.