心领神会

tā shuō shí jiān bù zǎo le wǒ xīn lǐng shén huì

她说时间不早了，我心领神会。

She said it was getting late, and I got the message.

huì xīn de wēi xiào zhǐ néng xīn lǐng shén huì bù shì wén zhāng cí jù suǒ néng biǎo dá

会心的微笑，只能心领神会，不是文章词句所能表达。

A smile from a heart can only be realised by a heart, and it allows no words in between.