What is intrinsic value?

THE following is an excerpt on intrinsic value from Benjamin Graham and David Dodd's seminal work, Security Analysis (sixth edition, 2009):

"We must recognise, however, that intrinsic value is an elusive concept.

In general terms it is understood to be that value which is justified by the facts, e.g., the assets, earnings, dividends, definite prospects, as distinct, let us say, from market quotations established by artificial manipulation or distorted by psychological excesses.