Paul Mayne, the founder of the Day One journaling app, shares his vision of creating a lifelong companion for preserving meaningful memories. He discusses Day One's evolution from an Apple-exclusive to a multi-platform favorite, emphasizing user experience and security. Paul reveals upcoming features like shared journaling and AI integration for enhanced functionality. The conversation also touches on the role of Stoicism in journaling practices, showcasing how personal reflection and nostalgia can deepen our understanding of life's moments.