Ren (third tone) - to endure; tolerate; put up with

How simple and obvious is it that this character consists of two: knife on the top and heart at the bottom. Literally - to stab one's heart. The way I learnt about it today: pain is inevitable when you put up with something, somebody. After a while pain transforms into learning, awareness and expansion. Only by not tolerating pain endures and cuts heart bit by bit.

Tolerate others like you would tolerate a child