and\begin{quote} ... \end{quote}
The quote environment is recommended for short quotations: the whole quotation is indended in the quote environment, but the first lines of individual paragraphs are not further indented. The input file\begin{quotation} ... \end{quotation}.
is typeset by LaTeX as follows:Isaac Newton discovered the basic techiques of the differential and integral calculus, and applied them in the study of many problems in mathematical physics. His main mathematical works are the \emph{Principia} and the \emph{Optics}. He summed up his own estimate of his work as follows: \begin{quote} I do not know what I may appear to the world; but to myself I seem to have been only like a boy, playing on the sea-shore, and diverting myself, in now and then finding a smoother pebble, or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me. \end{quote} In later years Newton became embroiled in a bitter priority dispute with Leibniz over the discovery of the basic techniques of calculus.
For longer quotations one may use the quotation environment: the whole quotation is indented, and the openings of paragraphs are then further indented in the normal fashion.