This is the invitation : 

The invitation calls on people to believe in Jesus—that he is the Son of God who became a man and died on a cross and rose again from the dead. Because of Jesus' work, God offers salvation from sin and death for free to the whole world. He does so much more than providing a way to heaven. He also brings freedom, healing and anointing to every believer.

Many of us struggle to understand the basics of salvation in Christian faith. This book offer a starting point to get to know some of the key issues surrounding salvation. I this book you will get: The wonderful presentation of salvation, the good news of salvation through faith in Jesus Christ alone. The opportunity to learn how to attain, live in this salvation, and maintain a holy life. Tools to support, encourage and inspire you in your daily Christian living. And much more...

So, accept this invite. The invitation calls all people to believe in Jesus—that He is the Son of God who became a man and died on a cross and rose again from the dead. Because of Jesus' work, God offers salvation from sin and death for free to the whole world. He does so much more than providing a way to heaven. He also brings freedom, healing and anointing to every believer.