This dissertation explains and defends Hegel's "dialectical" logic and the useful critical and normative contributions it can make to philosophy and some aspects of life. Hegel's logic investigates metaphysical "logical" determinations which constitute the structural principles of everything generally, but his context-neutral conception of logical structures and his non arbitrary method sets him favorably apart from other philosophies. It dispenses with the issue whether metaphysics illegitimately projects the mental onto a pre-given world of experience, since even distinctions like "mind versus (...) matter" presuppose prior logical structures. These structures underly other philosophical programs, so Hegel's logic can play an explanatory and critical role against alternatives. Moreover, Hegel's logic neither presents insuperable methodological problems nor suggests absurd conclusions about topics like the law of noncontradiction. ;In Chapter Three I explain and develop Hegel's theory of truth as the correspondence of something's developed, actual existence to its own structural nature. Human thinking and activities especially exemplify truth, since humans have the ability to make themselves and their activities correspond most closely to what they ought to be. In his logic Hegel then provides a normative logical model for becoming a "true" human being: an intrapsychically integrated, normatively committed and free agent engaged constructively with one's social world. ;In Chapter Four I argue that speculative logic can solve and remain invulnerable to longstanding problems in traditional skepticism, especially the more powerful ancient type. Skepticism is effective because its arguments against philosophical claims are implicitly structured according to underlying logical determinations of the types Hegel describes. Skeptical conundrums correspond to the local opposition between the first two moments of dialectical triads, but I show that these moments are only two unintegrated halves of a superior logical structure. In this way, Hegel's logic is able to explain and beat skepticism on a deeper level. (shrink)