Indeed a good quotation hardly ever comes amiss. It is a pleasing break in the thread of a speech or writing, allowing the speaker or writer to retire for an instant while another and greater makes himself heard. And this calling-up of the deathless dead implies also a community of mind with them, which the reader will not grudge the author lest he should seem to deny it to himself.
In literary composition a well-chosen quotation lights up the page like a fine engraving.
...the taste of the finely-worded truth rolled upon the tongue as its thought is revolved in the mind.