(1) is fine. In (2) and (3), keep in mind that "success" is a noun, and "successful" is the adjective.
People are successful, or have success. If they have success, it's better to say what they have success in. You can also say people are a success. Note the article that transforms an abstract state of success into a concrete story of success. Or you can use the verb succeed.
So: Lazy people will never be successful, or Lazy people will never have success [in their lives], or Lazy people will never be a success, or Lazy people will never succeed. Similarly for (2).
Student or Learner