The quote emphasizes the inherent challenges that come with pursuing difficult goals. It suggests that initial efforts may not yield success, and that one should not expect things to be easy. The notion is that facing tough situations is a normal part of growth and progress.
Furthermore, the quote reassures that while the process may be draining, energy is a resource that can be replenished. This perspective encourages perseverance, indicating that pushing through adversity can ultimately lead to personal development and success.