Science is not just about discovery, but about the joy of understanding.

解释：婚姻是难以预测的事情，既可能收获幸福，也可能招来祸患。婚姻事关人生的祸福，是家庭兴旺或衰败的根源，是人生十分重大的事情，好的婚姻给人以幸福，坏的婚姻给人以祸患。

The true revolutionary is guided by a great feeling of love. It is impossible to think of a genuine revolutionary lacking this quality.

怀疑是智慧的开端，而非敌人。

Without food, man can live at most but a few weeks; without it, all other components of social justice are meaningless.