坚忍不拔 ｜jiān rěn bù bá

This chengyu is from Xi Jinping’s New Years Day address (video and full text)

Meaning: Tenacious, unshakable, describes perseverance and firm conviction

Original: “面对突如其来的新冠肺炎疫情，我们以人民至上、生命至上诠释了人间大爱，用众志成城、坚忍不拔书写了抗疫史诗。”

Source: http://cpc.people.com.cn/n1/2021/0101/c64094-31986373.html