Knowledge
Knowledge is power  which was said by Bacon is well-known to all. It plays more and more important part in our lives at present.
With the development, we must learn more and more knowledge in the practice, or we can drop behind.
You must find that some TV programmes, such as "Millionaire", are becoming more and more interested in knowledge if you watch them carefully. "The Lucky Fifty-two" is also not exceptional. We can learn something that you don't know before from the TV programmes.
In a word, knowledge is wealth. It controls our lives. So we must learn hard from books, the practice, the TV programmes and so on. Don't forget that there is only one good --- knowledge, and one evil --- ignorance.