Nothing is harder than begging for help,more bitter than being poor,colder than human kindness,and more dangerous than people's mind. Know,then live. 登天难，求人更难，黄连苦，贫穷更苦；春冰薄，人情更薄；江湖险，人心更险。知其难，守其苦，耐其薄，测其险，可以处世矣。