落笔映惆怅提笔写忧伤
[luò bĭ yìng chóu chàng tí bĭ xiĕ yōu shāng]
The translation can go something like 'Brush Down Shows Melancholy, Pen up Expresses Sorrow.' These actions describe someone's way of expressing sadness through writing or painting, revealing the depth of sorrow hidden in heart.