This is an investigation into Kant's critique of dogmatic rationalism in the writings of the 1760s, which comprise the so-called pre-critical texts, written before the publication of the Critique of Pure Reason in 1781. The work deals with three texts by the philosopher Immanuel Kant: "The Only Possible Argument for a Demonstration of the Existence of God", "An Essay to Introduce the Notion of Negative Magnitudes in Philosophy" and "Dreams of a Visionary Explained by Dreams of Metaphysics", which each in their own way set up a clash with the dogmatic metaphysicians, along with the recurring problems of the time, such as: the problem of metaphysical method, the innovations of Newtonian science and English and French empiricism, which led Kant to reflect on the limits of rational knowledge and its suprasensible proofs, and the possibility of grounding metaphysics as a science of the limits of reason.