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The heart, as the great Chinese Sage Mencius defines it, is the sense organ that knows the good just as the tongue knows the delicious and the eye the beautiful. The good is beautiful to the heart. Here’s what Mencius said:
” . . . all palates have the same preference in taste; all ears in sound; all eyes in beauty. Should hearts prove to be an exception by possessing nothing in common? What is it, then, that is common to all hearts? Reason and rightness. The sage is simply the man first to discover this common element in the heart. Thus reason and rightness please my heart in the same way as meat pleases my palate.”

What Mencius means is that the heart ‘knows’ what is reasonable and right, the way the eye knows what is physically beautiful. When we embody, or live out, what is reasonable and right, the heart is pleased. Through a devoted practice to being reasonable and right, we find the heart. When this inherent sense is optimally cultivated this ends in the ultimate moral development, which means becoming a Sage.

For Mencius, the heart is the seat of compassion. Mencius describes compassion as the “unbearability of suffering of any creature.” This natural reaction to the suffering of others is Mencius’s primary proof of the inherent goodness of people. The universality of this empathic faculty is captured in his statement, “No man is devoid of a heart sensitive to the suffering of others.” He uses as proof the argument that any sentient human would react with horror if they saw a child about to fall into a well. This feeling would occur spontaneously, and not for any extrinsic purpose. He suggests that this natural attribute is the most important aspect of humanness, and is what needs to be cultivated in order for one to achieve jen, or to be truly humane.