The body thinks in the ways of objects and as such, the brain is to rule the body and thoughts. Hurlock makes a distinction between two types of thinking – one is located in the brain and the other is located in the body. This chapter of the book also contains a discussion of Cartesian dualism. Hurlock points out that propositions are the best way of explaining the world, as is the case in science. One example of this is the fact that people make error with the use of propositions and propositions are formulated in language. He also gives examples of why propositions and language are inevitable. Hurlock also rejects all approaches that are not objective, which is often called subjectivism, and in this he seems to be leaning towards idealism. He also considers and rejects what has been called non-realism, i.e., an approach that considers only real things to exist, and thereby dismisses all propositions. Hurlock seems to be an advocate of the many-valued logic, for he speaks of an 'inconsistency theory of truth' which in other books of his is called 'propositional logic'. This chapter of the book contains a general discussion of logic.

That is, the autocrat is to rule, and the democrat is to obey. Throughout this chapter and the next, Hurlock states that the psyche is composed of an autocrat and a democrat. Book, Chapters 10–17 contain a comprehensive description of the mind, and in particular the mind of a normal adult human being.

Ebook Psikologi Perkembangan Hurlock