So that we can understand those few lines
In one of the books he learned that the most important text in the literature of alchemy contained only a few lines, and had been inscribed on the surface of an emerald.
"It's the Emerald Tablet," said the Englishman, proud that he might teach something to the boy.
"Well, then, why do we need all these books?" the boy asked.
"So that we can understand those few lines."