[2] When a person is first born only the immature bodily part exists; but this has within it the capacity to become fully developed. Subsequently he becomes natural, and at length rational. From this one may see that communication takes place between one part and another. The bodily part communicates with the natural by means of the senses, doing so through the senses belonging to the understanding in a distinct and separate way from its communication through those belonging to the will; for both understanding and will have to become fully developed in a person if he is to become and is to be fully human. The perceptions of the senses of sight and hearing serve in particular to develop fully his understanding, while the other three senses have regard in particular to his will. The bodily part of man's mind communicates with his natural - which, as has been stated, is the intermediate part - by means of the senses. For the things that enter through sensory experience accommodate themselves within the natural as a kind of receptacle for them. This receptacle is the memory. The delight, pleasure, and desire there belong to the will and are called natural goods, but the facts there belong to the understanding and are called natural truths.

[3] By means of these things just mentioned the natural part of man's mind communicates with his rational which, as has been stated, is the interior part. The things which rise up from the natural to the rational accommodate themselves in the rational likewise as in a kind of receptacle. This receptacle is the interior memory, dealt with in 2469-2480. The blessing and happiness there belong to the will and are forms of rational good, while the interior insights into things, and the perceptions of these, belong to the understanding, the objects of those insights and perceptions being called rational truths. These three - the bodily, the natural, and the rational - are what constitute a human being. Means of communication exist between these three, the external senses being the means by which the bodily part of a person's mind communicates with his natural, and the interior senses those by which the natural part of his mind communicates with his rational. Therefore it is those things which are present in the natural part of a person's mind, and which have been derived from the external senses that belong properly to the body, that are called the rather external and the fully external truths of good. But those which have been derived from the interior senses, which belong properly to his spirit and communicate with the rational, are the ones which are called interior goods and truths. And those which come in between and partake of both are the ones which are called intermediate goods and truths. These three groups of truths, starting in order with interior, are what are meant in the internal sense by 'flocks', by 'servant-girls and slaves', and by 'camels and asses'.