It's hard to summarize a book of essays on diferent subjects, but I'll try.
There are four parts:
Part One -- 23 essays.
Part Two -- 16 essays
Part Three -- 9 essays.
Part Four -- letters Lewis wrote, along with some answers.
These essays cover many subjects. He was profound and thorough Christian writer. I grew up in a strong Christian home and I've read a lot of good Christian authors, but this book has influenced me deeply.
These were the essays that stood out to me:
1. Essay #13 on page 114 (Section one)
2. Essay #1 on page 189 (Section 2)
3. Essay #3 on page 196 (also Section 2) which contains one of the best treatments I've ever read on the subject of politics and religion.
It was a real boost to my Christian faith, and I've worn out two copies of it.