Hitherto at the beginning of a sentence?

It is generally considered poor form to start a sentence with 'because' because "because' introduces an argument that supports or explains the initial statement. If you start with 'because' there may not be an initial statement. Sometimes the initial statement is moved to the end of the sentence to achieve dramatic effect. For instance: Because of the bad smell, he left.

When you are talking, 'because' or 'cause' or (shudder) 'coz' are used more for fillers. In other Words, they allow you to keep your mouth running while your brain is trying to catch up.