In view of the present reality and, above all, the main challenge nowadays that is to save the Planet, our Common Home, many steps must yet be taken, but in accordance with the history already made so far. The collaboration between believer and non-believers becomes ever more necessary and urgent with each day. Therefore, it is also necessary to refl ect upon certain fundamental topics that help us walk together, such as: ethics, truth, transcendence, immanence, development, sustainability, cultural pluralism, human nature, common platform, laicism, reciprocity, donation etc. This essay offers a small contribution on this Year of Mercy to the request presented to us by Pope Francis to dialogue with the world, especially from the various experiences of the Courtyards of the Gentiles that many dioceses of the catholic Church and lay institutions are performing in the world, always seeking dialogue with the society in general, with believers or with non-believers. The purpose is to refl ect together to fi nd possible ways to save our planet, from an ethical starting point mindful of sustainability and that also respects the Transcendent. Surely in the future mankind will know more development than in the present-day, but the greatest challenge is that of achieving it always in a responsible and sustainable manner in view of the common good and not of the privileged few. Therefore, it is imperative that believers and non-believers can and must work together. The horizon will always be that of a fruitful dialogue and also that of respect in relation to the mystery of the Transcendent present in the work of Creation for the good of all men.