In 1967, Werner Heisenberg—Nobel Prize-winning physicist and pioneer of quantum mechanics—received an unexpected letter from a young Italian Jesuit named Enrico Cantore. The letter, beginning simply with "Dear Professor Heisenberg," marked the start of a decade-long exchange focused on bringing to life a shared vision: scientific humanism. Drawing on newly uncovered materials from the Max Planck Institute Archives in Berlin, this book reveals a rarely seen side of Heisenberg—his role as a mentor and advocate in the creation of an interdisciplinary research institute, even as institutional politics threatened to stifle Cantore's efforts. Readers will follow Cantore's struggle to bridge philosophy and science within traditional academic boundaries and see how Heisenberg's unwavering support helped bring this ambitious project to life. Whether you're interested in the academic and publishing world of Heisenberg's time or curious about the human dimensions of intellectual pursuit, this collection reveals a powerful story of mentorship, courage, and the enduring belief that science can—and should—serve the greater good.