In order to better understand the doctrine of progressive revelation, it is instructive to compare it with the work of the main representative of historical consciousness in Western philosophy, Hegel. Hegel's philosophy represented a turning point in Western philosophy precisely because he emphasized the dynamic nature of reality as a dialectical process. In his approach to the study of religion, Hegel applied his dialectical model to the realm of religious history as well. Dialectical method sees reality as the unity of Opposites. Each side of this unity contains its Opposite within itself. The true totality is realized when the opposition of the two sides is cancelled and they are united in a higher totality.
Hegel conceived of religious history as a dialectical process comprising three stages. In the first stage, worship of the Absolute Reality takes the form of the veneration of natural phenomena. The second stage is the worship of the Absolute as God, a spirit that is conceptualized as the creator of the universe but which is entirely opposed to material nature. Hegel, however, found both these approaches to religion inadequate. He posited as the final stage in his sequence what he termed "Christianity," in which God and the world become identical, and the believer finds God to be immanent in the world. Hegel's pantheistic interpretation of Christianity was based on the doctrine of God-manhood, or incarnation - the belief that in Christ God has become flesh. Thus human beings and God, or nature and Creator, are perceived as one and the same reality. For Hegel the apparent merging of opposites in this stage represents the consummation of the dialectical unfolding of religious truth, and is explicated as the attainment of divine self-consciousness.
Although the Báb does not address the works of Hegel, His writings address virtually the same questions Hegel grappled with. Hegel's philosophy of religious development advocates a thesis of historical consciousness and change, and it attempts to transcend the opposition between the spiritual and the natural realms. Both of these issues are addressed by the Báb. However, unlike Hegel, who terminates historical dynamics in the final resolution of the dialectic, the Báb sees no end for the dynamics of religious truth. Even the truth represented by the Revelation of the Báb, in the inception of the age of the sanctuary of the heart, is still partial and relative to the receptivity of human beings in the current Stage of spiritual development. The writings of the Báb thus introduce a truly historical consciousness, one which avoids the static thesis of the end of history.
Hegelian theory achieves its positive orientation to nature by dissolving God into the level of phenomenal beings. But for the Báb such a pantheistic conception is not an advanced consciousness, and the Hegelian dialectic is typical of the tendency of human beings to take the categories that pertain to their own reality and then elevate them to descriptions of the Essence of God. This attitude is comparable to that of an ant who defines God as a reality whose antennae stretch to infinity. According to the Báb, any claim to rationally understand the Absolute Mystery is a sign of imprisonment within one's self. Although the perspective of the heart transcends the limited categories of intellect, this perspective is never suggested as a means of understanding the Essence of God but, rather, the revelation of God at the level of the phenomenal world.
The main problem with the Hegelian construct is that Hegel, like some of the Sufi writers, confounds the Essence of God with the realm of divine Action. The conception of God that Hegel speaks of - a God that was first conceived as the creator of the world and then discovered to be the same as the world - refers, in the Báb's terms, to the twin stations of the Point or the Primal Will, where the unity of opposites is realized. This realm, however, is neither the unity of the world with the Essence of God, nor a static final point of civilization. Instead, it represents the dynamic principle of progressive revelation. Nor is this station confined to Christ; it is the reality of all the Manifestations of God. Christ was the Manifestation of the Primal Will in the world at a particular Stage of humanity's spiritual development.
Therefore, Hegelian philosophy, at best, can be viewed as a somewhat crude affirmation of the principle of manifestation, and the thesis of the identity of God and human in Christ as an inadequate expression of this general doctrine. The Manifestations of God do represent the revelation of God in the phenomenal world. But unlike Hegelian theory, which takes this fact as evidence for the end of history and of religious progression, the Báb defines this principle as progressive revelation, and as the resolution of the existential paradox of human reality. The Báb affirms the principle of manifestation in order to announce not the end of spiritual dialectics but the perpetual renewal of divine revelation. The metaphysical truth that the doctrine of the trinity attempts to explain, thus, has nothing to do with the Essence of God. Rather, it is an affirmation of the triad of Will, Determination, and Destiny, or the Manifestation of God in the world.(from Gate of the Heart, Saiedi)