Fidelity: How to Create a Loving Relationship That Lasts (Thich Nhat Hanh)
Every Thich Nhat Hanh work that I've read so far has expanded my mind and soothed my soul at the same time. It's a rare piece of writing that can both push you outside your comfort zone and provide you with comforting reassurance. His messages are so simple yet profound, I felt the need to read each sentence multiple times in order to really absorb their full meaning. Highly recommend for anyone looking to authentically invest in their relationships.