心苦不是辛苦
[xīn kŭ bù shì xīn kŭ]
'心苦' (Xinku) is composed of two Chinese characters which mean heart and bitterness separately, it describes the bitter feelings at heart. However,'辛苦' stands for physical tiredness or pain from hard labor work. The phrase conveys that even if your body may not endure hardships, your heart could still suffer.