How Can Faith be Reconciled with Rationalism?

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by the Lubavitcher Rebbe Menachem Mendel Schneersohn ztz'l

We normally suppose that faith belongs to the realm of transcendence, to the realm of the super-rational. This is analogous to the semi-prophetic state described by the Talmud, “though they did not see, their transcendent soul saw.” [Megillah, 3a] 

Essential faith, however, does not depend on a transcendent vision beyond the self but stems from the subjective essence of the self. At the very core of your own self you are essentially bound up with G‑d, and it is this essential soul bond that is the basis of a faith that is subconsciously synonymous with your own identity. All the faculties of your soul, including your capacity for cognition and critical thought, are windows via which your essential soul makes itself manifest. Accordingly, essential faith does not intrude on your rational mind from beyond but arises from the subconscious realm within. 

Essential faith, in other words, is integral to every aspect of your soul—including the soul as it is vested within the rational mind, within the body, within the world as we inhabit it and experience it. Even the rational mind is ultimately a lens through which your essential soul-faith can be refracted and intelligently internalized.

Source: Four Teachings the Rebbe gave us to live by