宋希仁在《南昌大学学报》２００１年第４期撰文指出，“应当”有其客观根据，并有着确定性，是人进行自由选择的　前提条件，同时，“应当”也有着正当性的价值，因而拥有对现实的批判权利。把道德的“　应当”从认识中提炼出来，表明人类对伦理关系和道德生活有了自觉意识。? In his article “Journal of Nanchang University”, No. 4, 2001, Song Xi-ren pointed out that “should” has its objective foundation and certainty, which is the prerequisite for people to make free choice. At the same time, “should” also has the value of justification Have the critical right to reality. The moral “should” be extracted from the understanding that human beings have a conscious awareness of ethical relations and moral life. ?