Deep Work gives insights into the importance of mastery and the value of doing deep work. I really like, and agree with, the thesis and hypothesis of the book. Every one should find value in this book and I often recommend it as one of my favorites.
The ONE Thing is incredible and is on my list of best books of 2018. It shares several similar concepts with Essentialism. The main concepts that helped me are learning to use the focusing question, being aware of the domino effect, and time blocking.
The author, Dr. Viktor E. Frankl, spent years in Nazi death camps. This book is a product of his suffering in these camps. Within are his thoughts on meaning, purpose, love, fear, suffering and more.