"We usually expand our capacities without changing our lives. People go off to meditation retreats and come back to their Manhattan existence; on the whole, they are not more serene, but they are much more knowing about where serenity might yet be found. People go to cooking school and don’t cook more; but they know how to cook. Dr. Johnson was once asked why he always rushed to look at the spines of books in the library when he arrived at a new house. 'Sir, the reason is very plain,' he said. 'Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it.' Almost all of our useful knowledge is potential knowledge."
~ Adam Gopnick in The New Yorker