The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.
农业的进步不仅要以产量衡量,还要以长期的环境影响来衡量。
问题在于我们不仅不理性,而且是可预测的非理性——我们的非理性行为会以同样的方式一再发生。