Although spoken English doesn't obey the rules of written language, a person who doesn't know the rules thoroughly is at a great disadvantage.

While you're writing, you can't concentrate nearly as well on what the speaker is saying.

Know about the appeals process, especially in the case of the most serious crimes.

Be able to analyze statistics, which can be used to support or undercut almost any argument.

The length of your education is less important than its breadth, and the length of your life is less important than its depth.

Know which officials are voted into office and which are appointed, and by whom.

Know how to travel from your town to a nearby town without a car, either by bus or by rail.