This study offers an epistemological discussion about the classic psychology and one of its present components, Gestalt therapy, using the trajectory of classical physics to quantum as a backdrop. There was a discussion through a review by addressing three points involving dichotomous (and still currently involved) a partial transition from classical physics to quantum physics (linearity versus nonlinearity; action and reaction versus complex; and classical mechanics versus quantum mechanics) and, illustratively, three points of discussion related to classical psychology as opposed to Gestalt therapy (causal versus existentialism; elementarism versus holism, and objectivity versus phenomenology). It was concluded that there are differences and similarities in the trajectories analyzed, as the paradoxical properties of its objects, the quantum and human consciousness, setting up contact points that enable a dialogue between both quantum physics and Gestalt-therapy.