This article is from the Quotations FAQ, by Sir Hans firstname.lastname@example.org Jason Newquist email@example.com with numerous contributions by others.
It is a good thing for an uneducated man to read books
Sir Winston Churchill (1874-1965)
"My Early Life" (1930) ch. 9
Dictionaries of quotations. There are several types: some are
intended mainly to allow the user to find out the who, what, and where
regarding well-known quotations (these are normally arranged by
author), some are there to help the speaker or writer to find ``pithy
sayings'' to support her or him (often subject-based), and others are
meant more to be read through and enjoyed by the reader (you'll be
lucky if you can detect any order at all). In practice these
distinctions are not that sharp--even the major DoQs for referential
use have their share of the more obscure and interesting, and some of
the latter type are actually useful if you want to find a source for
something. Some DoQs are subject-based as well, and whether you're
interested in love, war, or music, you'll be able to find one about it.
If you're seriously interested In quotations you will definitely want
to have at least either "Bartlett's Familiar Quotations" or "The Oxford
Dictionary of Quotations"; see below for details.