Siddhartha is the tale of a man driven by an insatiable desire for truth. Unlike the great mass of men who live and have ever lived (and, no doubt, who will live) the eponymous character is unable to bury the innate human desire for truth, transcendence, and eternity beneath the morass of material things and temporal (and therefore temporary) concerns. He is unable to forget that man, however pervasive illusion and delusion might be, was placed into this world for other and better reasons than the satisfaction of ultimately meaningless desires, enjoyment of passing pleasures, and obsessions with works the effects of which will hardly outlast the moment of their performance.
It is rather, as Siddhartha knows and cannot force himself to forget, that man was created for something altogether of another order. He was created to seek after what is good, what is true, and what is beautiful. The highest end of man and the purpose for which he was created surpasses the merely earthly and the merely momentary.
Only after years of struggle with his self and his world is Siddhartha able to realize that he had been seeking since his youth had been with him — in him — all along. It had, in fact, been him — and everything around him. It was — it is — the all-pervasive presence of the divine, which encompasses, unites, and yet exceeds the entire created order.