From Desiring God:

Alive to Wonder: Celebrating the Influence of C. S. Lewis is a collection of extended excerpts from John Piper’s corpus where Lewis’s fingerprints are most vividly seen, including a significant introduction from Piper specially written for this project.

The book is available for a free download in PDF, EPUB (iBooks, Nook), or MOBI (Kindle) formats.

Why did Piper put this book together?

“In this fiftieth year since he died, I offer this little book as a celebration of the influence of C. S. Lewis in my life. I hope I do so in humility. I know I do so with profound thankfulness” (p. xi).

Download the book at Alive to Wonder by John Piper Celebrating the Influence of C. S. Lewis.