This work explains the philosophy of the conceptual network (field of meaning) as well as the evolution of this network in the course of individual development (ontogenesis), biological development (phylogenesis), and cultural evolution. According to the proposed idea, the substance of our mind is constituted by a conceptual network that is composed of continuous concepts that have meanings through connotation. The conceptual network is an epiphenomenon of the neural network that is based on a dynamic structure of a complex of neurons interconnected in a functional way. Language is a secondary phenomenon in relation to the conceptual network: the words of language correspond to the best-distinguished concepts, and their meaning is determined by their conceptual 'lining'. (Self-)consciousness appeared as a result of the recurrent self-reference, directing on itself of the neural/conceptual network, the 'cognitive' center in the human brain. The mutual relationship between the conceptual network and science, culture, and philosophy is also discussed.