Answer:
Yes, the first sentence of the third paragraph is an effective statement of the paragraph's main idea.
The sentence states that 'the key to success lies in having a clear goal and a commitment to achieving it,' which is the central theme of the paragraph.
The sentence is further supported by the details that follow, such as the importance of setting a specific timeline, breaking a goal into smaller steps, and tracking progress.
This reinforces the idea that having a clear goal and a plan in place are essential for success.