... the book told him of other ways of the world; of cruelty, suffering, and death. He read of greed, hatred, and war; of men striving against one another with fire and sword; of the blossoming earth trampled underfoot, of harvests lost and lives cut short...
But now his heart lifted. These pages told not only of death, but of birth as well; how the earth turns in its own time and in its own way gives back what is given to it; how things lost may be found again; and how one day ends for another to begin. He learned that the lives of men are short and filled with pain, yet each one a priceless treasure, whether it be that of a prince or a pig-keeper. And, at the last, the book taught him that while nothing was certain, all was possible.

The Foundling, pp. 25–27 - The Foundling and Other Tales of Prydain (1973)