Rebuilding a healthy and harmonious relationship with Nature, addressing the issue of population growth, coming to terms with the problems of energy resources, and putting an end to conflicts that destroy entire peoples and ecosystems. These are topics that over the past thirty years have been addressed on several occasions from many points of view and have in Aurelio Peccei a true forerunner. Founder of the Club of Rome and promoter of the famous report entitled The Limits of Development, he tackled together with SGI President Daisaku Ikeda many issues that still impose themselves, even more urgently, on our attention today. The task the two authors took on was onerous, especially because of the obvious difficulty of "singing out of the choir," that is, trying to stimulate a major international debate on topics that few were willing to question. But it is precisely in this that one recognizes the caliber of the great protagonists, who become bearers of messages that transcend the present moment and urge us to build a clear vision of the future.