The essence of mathematics lies in its freedom.
过去从来不仅仅是过去。它始终是现在的基础。
Human kindness has never weakened the stamina or softened the fiber of a free people. A nation does not have to be cruel to be tough.
生产与再生产的客观行为模式概率性地决定了家庭与政治经济的客观行为,进而概率性地决定了行为与心理的主观上层建筑。