… is from page 78 of the 2011 Definitive Edition of F.A. Hayek’s 1960 book, The Constitution of Liberty:
The more men know, the smaller the share of all that knowledge becomes that any one mind can absorb. The more civilized we become, the more relatively ignorant must each individual be of the facts on which the working of his civilization depends. The very division of knowledge increases the necessary ignorance of the individual of most of this knowledge.