This statement emphasizes the futility of worrying and the importance of focusing on living in the present. In the first paragraph, it means that worrying is unproductive and doesn't lead to positive outcomes.
The second paragraph suggests that life is a mix of both favorable and unfavorable experiences, and the key is to keep moving forward without becoming overly stressed about circumstances beyond your control.
The final paragraph underscores the idea of embracing a proactive and positive approach to life. This quote reflects the notion that while challenges and uncertainties are inevitable, worrying about them doesn't contribute to their resolution. It encourages a mindset of resilience and acceptance, focusing on what you can influence rather than fixating on what you cannot.