The difference between something good and something great is attention to detail.

The difference between good design and great design is intelligence.

Fastidious attention to detail makes the difference between an OK service and first class service.

We are all faced with a series of great opportunities brilliantly disguised as impossible situations.

Knowing is not understanding. There is a great difference between knowing and understanding: you can know a lot about something and not really understand it.

I think it is important to begin with a statement in your speech that grabs the attention of the audience. I try to make my opening line 15 words or less.