The essence of the statement at the beginning of the text is similar to a text statement. What is the purpose of repeating the statement

the first paragraph is the main idea of the text.

so if there is main idea, it must be explanations after that, right?

and about purpose of repeating the statement, I think... there are no repeating statement.

1. Important of Eng Lang
2. Eng is an international Lang
3. Easier to get knowledge
4. Some people need it to seeking a job
5. Conclusion.