Commonly, the dialectic between infinite and the finite leads us to Hegel´s Science of Logic. However, there is a whole period of youth where there is a series of preceding reflections. This research studies the origin of the dialectic between infinite and finite in Hegel´s thought. For this purpose, three forms of unification are examined in three texts: the unification of the spirit of Judaism, the unification through love and belief, and the unification proper to the spirit of Christianity.