If we suspend our own predilections for the moment and instead go directly to our sources, we come upon the indisputable fact that the Buddha himself taught rebirth and taught it as a basic tenet of his teaching. Viewed in their totality, the Buddha's discourses show us that far from being a mere concession to the outlook prevalent in his time or an Asiatic cultural contrivance, the doctrine of rebirth has tremendous implications for the entire course of Dhamma practice, affecting both the aim with which the practice is taken up and the motivation with which it is followed through to completion.
The aim of the Buddhist path is liberation from suffering, and the Buddha makes it abundantly clear that the suffering from which liberation is needed is the suffering of bondage to samsara, the round of repeated birth and death. To be sure, the Dhamma does have an aspect which is directly visible and personally verifiable. By direct inspection of our own experience we can see that sorrow, tension, fear and grief always arise from our greed, aversion and ignorance, and thus can be eliminated with the removal of those defilements. The importance of this directly visible side of Dhamma practice cannot be underestimated, as it serves to confirm our confidence in the liberating efficacy of the Buddhist path. However, to downplay the doctrine of rebirth and explain the entire import of the Dhamma as the amelioration of mental suffering through enhanced self-awareness is to deprive the Dhamma of those wider perspectives from which it derives its full breadth and profundity. By doing so one seriously risks reducing it in the end to little more than a sophisticated ancient system of humanistic psychotherapy.
The Buddha himself has clearly indicated that the root problem of human existence is not simply the fact that we are vulnerable to sorrow, grief and fear, but that we tie ourselves through our egoistic clinging to a constantly self-regenerating pattern of birth, aging, sickness and death within which we undergo the more specific forms of mental affliction. He has also shown that the primary danger in the defilements is their causal role in sustaining the round of rebirths. As long as they remain unabandoned in the deep strata of the mind, they drag us through the round of becoming in which we shed a flood of tears "greater than the waters of the ocean." When these points are carefully considered, we then see that the practice of Dhamma does not aim at providing us with a comfortable reconciliation with our present personalities and our situation in the world, but at initiating a far-reaching inner transformation which will issue in our deliverance from the cycle of worldly existence in its entirety.
Admittedly, for most of us the primary motivation for entering upon the path of Dhamma has been a gnawing sense of dissatisfaction with the routine course of our unenlightened lives rather than a keen perception of the dangers in the round of rebirths. However, if we are going to follow the Dhamma through to its end and tap its full potential for conferring peace and higher wisdom, it is necessary for the motivation of our practice to mature beyond that which originally induced us to enter the path. Our underlying motivation must grow towards those essential truths disclosed to us by the Buddha and, encompassing those truths, must use them to nourish its own capacity to lead us towards the realization of the goal.
Our motivation acquires the requisite maturity by the cultivation of right view, the first factor of the Noble Eightfold Path, which as explained by the Buddha includes an understanding of the principles of kamma and rebirth as fundamental to the structure of our existence. Though contemplating the moment is the key to the development of insight meditation, it would be an erroneous extreme to hold that the practice of Dhamma consists wholly in maintaining mindfulness of the present. The Buddhist path stresses the role of wisdom as the instrument of deliverance, and wisdom must comprise not only a penetration of the moment in its vertical depths, but a comprehension of the past and future horizons within which our present existence unfolds. To take full cognizance of the principle of rebirth will give us that panoramic perspective from which we can survey our lives in their broader context and total network of relationships. This will spur us on in our own pursuit of the path and will reveal the profound significance of the goal towards which our practice points, the end of the cycle of rebirths as mind's final liberation from suffering.