Tim Tebow is challenging people to take charge of every single day with his latest book.

The former NFL star turned minor league baseball outfielder, is releasing his upcoming book This Is The Day on Sept. 25. A preview of the book’s first chapter reveals the athlete and bestselling author’s inspiration for writing it.

“I wrote this book to get you to start thinking about what you can do, beginning today, to make a change. It doesn’t have to be a grand gesture. Something as simple as recognizing divine moments, choosing to believe God over your doubts, taking action instead of complaining, and just opening your eyes and paying attention can impact your life and others’ lives in powerful ways,” the 30-year-old athlete wrote. “It’s never too late. You’re not too young. You’re not too old.”

Tebow is encouraging people to live each day of their lives in purpose.

“You can have purpose not only in your life but also in this day. There is always something you can do right now to improve yourself, to make an impact on someone or something else, or to create or enjoy a meaningful moment,” he said. “Challenge yourself right now to begin to think about each day as an opportunity to crush it, to pursue the right things, to gain a better perspective, to step out of your comfort zone, and to go all in.”

So excited about my new book #ThisIsTheDay. I hope this book will encourage you to stop putting off for tomorrow what God is calling you to do today. Pre-order today on my website and get a #SoGood #ThisIsTheDay wristband! https://t.co/67a8lA783A

— Tim Tebow (@TimTebow) August 6, 2018

According to a synopsis of the book on the Waterbrook Multnomah publishing website, Tebow often encounters people who feel stuck in life.

“When Tim interacts with the public, he often encounters people who feel ‘stuck’–unable to take action on matters ranging from daily life to pursuing lifelong dreams. In response, Tim often identifies a crippling fear or lack of courage, to which he advises: ‘now is the time to take some risks, to quiet the voices of defeat, to step forward and make a mark, because this is the day,’” a description of the book reads. “In this inspiring, motivational book, readers will receive the advice and encouragement to daily move from ‘pause’ to ‘play’ in finding deeper meaning and success. Tim illustrates the book’s themes with stories from his personal life that will delight all readers, including his an update on his dream pursuit of a baseball career.”