“Set a goal that's meaningful and compelling enough, and your skills, your knowledge and your effectiveness will expand in order to reach that goal.”

Simplified Meaning:

When you have a goal that really matters to you and excites you, you will push yourself to learn new things and become better in order to achieve it. Imagine you want to run a marathon. You might start with small runs, but because running the marathon is so important to you, you’ll find ways to keep improving. You might read about running techniques, join a running club, or get advice from experienced runners. As you work towards this big goal, you’ll notice that you are becoming stronger and faster. The excitement and importance of your goal give you the drive to keep improving. This shows that when you care deeply about something, you naturally find ways to grow and improve to get there. So if you pick a goal that really matters to you, the journey to reach it will make you better in many ways.