本书分内、外两编、二十个易学命题。作者认为,人的生命活动,包含处世方法和德性涵养两个层面的内容,撇开后者只谈前者,则容易流于机心与游世;撇开前者只谈后者,则容易流于迂腐与拘谨。所以,内篇讨论人生活动的德性基础,外篇讨论人生活动的方法原则。前者可谓变中之常,后者可谓常中之变。而在现实生活中要有机地结合二者。 The book points, outside two series, twenty easy to learn proposition. The author believes that the human life activities, including the world approach and moral content of two aspects, leaving aside the latter only talk about the former, then easily flow in the movement and the world; aside the former only talk about the latter, then easy to flow pedantic And cautious. Therefore, the inner part discusses the moral foundation of life activities, the outer part discusses the principle of life activities. The former can be described as a constant, which can be described as the constant change. In real life, it is necessary to combine the two organically.