Search the quote database using a word or short phrase.
It's best to start with a single word, and see what results you get.
Based on the results, refine your choice of word or phrase.
You can then refine the results to show only quotes of a certain length: short, medium, long.
You can also further refine the results to include only quotes of a certain level of seriousness (the "gravity" setting), level of diction, and intellectual level.
In addition, you can confine the results only to sources within certain time periods.