Any attempt to understand the various influences which have shaped the thinking of Pope John Paul II on the fiftieth anniversary of his priestly ordination must reckon with the 32 years of Karol Wojtyla's priesthood prior to his papal election in 1978. Indeed, in total honesty, one must also probe the 26 years of Wojtyla's youth and early adulthood prior to his ordination November 1, 1946. Someone with even a basic knowledge of the thought of Karol Wojtyla has to acknowledge the profound degree of continuity between the prepapal thought of Karol Wojtyla and the papal thought of John Paul II. Unfortunately, Karol Wojtyla's prepapal thought remains a neglected field of study, less so among philosophers than among theologians in the United States, but still a field worthy of more attention than it has received. In this essay I want to discuss some of the influences of Wojtyla's thought during those Polish years, influences which in my judgment have left lasting marks on his thought. I identify seven such factors, though I would not claim that this list is exhaustive. These seven factors are rather convenient points around which to arrange the prepapal influences on John Paul Il's thought. These seven are: (1) the interwar Polish ethos; (2) Polish literature; (3) Carmelite mysticism; (4) Neoscholastic Thomism; (5) Lublin Thomism and phenomenology; (6) interwar and postwar Catholic thought in Poland; and (7) the Second Vatican Council.