人心莫测[rén xīn mò cè]
The human heart is a mystery.
1. 人心莫测的翻译
1. 孔子在周游列国饱受各种冷潮热讽，危机险阻后，对人心之莫测有了更透彻的体验。
In traveling around the countries, Confucius received various cynicisms and confronted plenty of crisis, from that, he had a throughout apprehension of human mind.