Apt quotations carry conviction. [ William Ewart Gladstone ]

Our best thought came from others. [ Emerson ]

Backed his opinion with quotations. [ Prior ]

Quotations are best brought in to confirm some opinion controverted. [ Swift ]

It often happens that the quotations constitute the most valuable part of a book. [ Vicesimus Knox ]

The problem with quotes on the internet is it's difficult to determine if they are genuine. [ Abraham Lincoln :) ]

Why aren't more gems from our great authors scattered over the country? Great books aren't within everybody's reach. [ S. T. Coleridge ]

A profusion of fancies and quotations is out of place in a love-letter. True feeling is always direct, and never deviates into by-ways to cull flowers of rhetoric. [ Bovee ]

He who calls in the aid of an equal understanding doubles his own; and he who profits by a superior understanding raises his powers to a level with the height of the superior understanding he unites with. [ Burke ]

I pick up favourite quotations and store them in my mind as ready armour, offensive or defensive, amid the struggle of this turbulent existence. Of these there is a very favourite one from Thomson: Attach thee firmly to the virtuous deeds
And offices of life; to life itself,
With all its vain and transient joys, sit loose. [ Burns ]

Whatever we may say against such collections which present authors in a disjointed form, they nevertheless bring about many excellent results. We are not always so composed, so full of wisdom, that we are able to take in at once the whole scope of a work according to its merits. Do we not mark in a book passages which seem, to have a direct reference to ourselves? Young people especially, who have failed in acquiring a complete cultivation of the mind, are roused in a praiseworthy way by brilliant quotations." [ Goethe ]