"I can give you the King's English and then I can take it to the street, but do both or do one and don't do one knowing only the street. That's going to hold you back because what comes out is going to impress people, and it will impress them negatively"

This quote by Angela Bassett is highlighting the significance of having a good command of both formal and casual language. She is suggesting that it is very important to be able to change in between the two, rather than just counting on one or the other. She is cautioning that if you only understand the casual language of the street, it will hold you back and make a negative impression on people. She is motivating people to learn both the King's English and the street language, so that they can use the right language for the best situation. This will help them to make a favorable impression on people and be successful in their undertakings.