A speaker is considered best if he is able to make the audience grasp his speech and makes them to be in their seats till the speech is done. There are many factors to be considered to give a great speech. The foremost is the speaker's vocal aptitude.
The usage of quotes is an effective tool to make vital statements before audience. You can always find quotes irrespective to the subject you speak. A right balance should be maintained between quotes and the actual message. You don't want to use up your entire speech just repeating other people's quotes. Quotes are great when it comes to starting a speech or ending one. Good quotes have a lot of impact and are so easy to locate.