Anyone who reads the speeches of Demosthenes and the letters of Cicero, or the essays of Bacon and Montaigne, will find how constant is the preoccupation of men with happiness and justice, with virtue and truth and even with stability and change itself.

• 凡是读过古希腊演说家德摩斯梯尼演讲集，古罗马政治家西塞罗书简集，或培根和蒙田论文集的人，都不难发现，人们都在专心不懈地探索幸福和公正，美德和真理，甚至连其永恒性和变化性也在探索之中。