The purpose of this research is to follow Hegel's path in the construction of his conception of reason in some of his first writings. We start analyzing the texts from Stuttgart (1785 - 1788) to 1800. We will show that Hegel has always intended to conceive reason differently from understanding and that his conception of reason corresponds to his ideal of unity, the unity of the universal and the individuality, his ideal of youth. Our study will guide to a comprehension of this ideal as an aesthetical-political ideal. Next, we will study two texts from the beginning of his stay at Iena – “The Difference Between Fichte's and Schelling's Systems of Philosophy and Faith and Knowledge”. The aim at this point is to show how Hegel starts elaborating his speculative philosophy as the auto production and autorecognition of reason. We also show that at the same time Hegel critics Kant's philosophy, he recognizes its value. Finally, the research presents the conception of reason at the Phenomenology of the Spirit. We follow the path of the "active reason" in its quest for the happy state, of fairness as the actualization of the unity of the universal and the individuality and we see the appearance of his intersubjective character. Our main objective is to show, despite the future development of his thoughts, the conception of reason remains as an ideal of unification.