The term nature, in a broad sense, refers to the phenomena of the physical world and life in general. Complex are their definitions, involving qualities of essentiality, origin, spontaneity, and everything that was not directly manipulated or produced by human action, including the universe itself. Taking into account that the sciences in their entirety have developed through their observation, the objective of this study is to promote the worldview of nature as a foundation for human self-knowledge, since according to the conception of human ecology, humans are conceived as an indivisible part of their environment. Faced with the current ecological constraints, the proposal is justified, above all, by the need to reconnect man with nature in a superficial and deep sense. For that, we used the theoretical revision method (especially conceptual contributions of Arne Naess and Carl Gustav Jung) and Aristotelian deductive thinking to reach the proposed reflections. The results suggest man as being indivisible from nature, reigned by forces, tendencies, instincts, and cycles similar to those of the natural environment. From natural contemplation it is believed possible to formulate deep understandings of human nature, be they biological, psychological or spiritual.