I am a huge fan of Henri Nouwen and this book is an excellent way to get into his work. It's a book of 365 devotions. Each day's devotion is thought-provoking, challenging, and also comforting. I read the book (almost) every night a few years ago, and it was a highly rewarding experience.
Nouwen is an amazing spiritual thinker and writer. I encourage you to look into the many books, essays, and prayers that he has written.