The essence of benevolence is a lubricant and buffer between ruling and being ruled. Although it is a lubricant and buffer, it is a third party, not recognized by any party, and lonely.
The greatest achievement of Confucius in this respect is the high recognition and pursuit of his theory by future generations. Harvest, after his death.
The biggest regret is that the lubricant and buffer of the third party are not recognized by any party, and he is lonely; Don't reuse it, just like shoeshine cloth. Use it once and throw it away when it's not used. Unfortunately, when he was alive.