Crucial Conversations: Tools for Talking When Stakes are High by Kerry Patterson is a very practical book that is applicable for business as well family relationships. I have used the information in this book to help families learn how to discuss challenging issues and I have used it in training people in the corporate world as well.
This book is not written from a spiritual perspective. However, I believe that there are solid Biblical principles that are the foundation for the reasons why what is taught in this books works. Learning how to stay in the “safe zone” during crucial conversations is absolutely a life skill that everyone needs to master.