人情冷暖我自知人情冷暖薄如纸
[rén qíng lĕng nuăn wŏ zì zhī rén qíng lĕng nuăn bó rú zhĭ]
Warmth and Coldness of Human Relationships Are Thin Like Paper and Known Only to Me. This phrase reflects the transient and superficial nature of human relations and how only one truly knows their ups and downs.