Symmetry is a complexity-reducing concept (co-routines include subroutines); seek it everywhere.
战场交锋,即使列阵有方,但以勇猛为本;操办丧事,即使礼节周全,但以哀痛为本;文人学士,即使学富五车,但以德行为本
世界上真正的悲剧不是正确与错误之间的冲突,而是两种正确之间的冲突。