无可奈何花落去似曾相识燕归来
[wú kĕ nài hé huā luò qù sì céng xiāng shī yàn guī lái]
This phrase is from an ancient Chinese poem, expressing a deep feeling of helplessness and nostalgia. The flowers falling are beyond one's control, yet familiar things or people return, symbolizing the inevitable changes and cyclical nature of life.