Chénmòguǎyán de rén yǒushíhòu nèixīn shìjiè hěn fēngfù.
People who are quiet often have a rich inner world.
Tips
memory
沉 (sink/deep) + 默 (silent) + 寡 (few/scarce) + 言 (words/speech). Picture someone sunken deep in silence with scarce words — a still pond, nothing rising to the surface.