• To begin with our knowledge grows in spots. ..What you first gain, ... is probably a small amount of new information, a few new definitions, or distinctions, or points of view. But while these special ideas are being added, the rest of your knowledge stands still, and only gradually will you line up your previous opinions with the novelties I am trying to instill, and to modify to some slight degree their mass. ..Your mind in such processes is strained, and sometimes painfully so, between its older beliefs and the novelties which experience brings along.