In this paper I try to make a general statement on different types of thought and to speculate upon what exactly thought with or without language might be. I will also attempt to show that the first stages of language development are not different from those of the development of thought. I believe that the manner in which a baby succeeds in knowing or in appropriating the complex object of language is the same as that in which he knows or appropriates any other object around him, including other people and even his own body. Then I will try to demonstrate that the same is true for later stages of development. This approach leads us to the conclusion that we should substitute for the dichotomy of verbal and non-verbal thought, a comparison of the different types of thought which characterize the phases of the construction of knowledge, including language. The opposition between thought with or without language has its origin in the opposition between practical and conceptual intelligence (Köhler, Guillaume, Meyerson, Piaget, Wallon, etc.). This dichotomy was classical at the beginning of the last century.