 Marcel holds that unconditional commitments such as these are best explained if understood as being pledged to an absolute transcendence. Indeed, given that life is full of temptations and challenges, the recognition of an absolute Thou also helps the individual to keep his or her commitments. Of hope he observes: “The only possible source from which this absolute hope springs must once more be stressed. It appears as a response of the creature to the infinite Being to whom it is conscious of owing everything that it has and upon whom it cannot impose any condition whatsoever” (Marcel, 1962a, p. 47). “Unconditionality,” as he has also noted, “is the true sign of God’s presence” (Marcel, 1950-51, p. 40). In general, his position is that the affirmation of God can only be attained by an individual at the level of a being-in-a-situation, or secondary reflection. At the level of primary reflection, the existence of God cannot be demonstrated, because the individual must be personally involved in the various experiences that can lead to an affirmation, but such genuine involvement is precluded at the level of abstraction. Yet, this does not mean that philosophy of religion in the traditional sense is not important; indeed Marcel’s reflections just mentioned must be regarded as part of an attempt to show, however indirectly, that belief in God is reasonable, but, as with all areas of primary reflection, we should recognize the limitations of a purely rational approach to religious belief.