Georg Wilhelm Friedrich Hegel

Hegel's "Science of Logic" (1812/1816) is one of the most influential philosophical writings of modern times and claims to be a scientific presentation of the system of pure reason.
The three parts, "Being", "The Doctrine of Essence" and "Subjective Logic or the Doctrine of the Concept", trace the path by which thinking determines itself to be an understanding and self-understanding thinking. Due to its concept of a self-criticising and self-determining reason, the "Science of Logic" has been considered an extremely challenging and difficult text to interpret from its publication to the present day.