The theme of Lady Poverty, embraced by Saint Francis, and the theme of Happy Sobriety, indicated in Pope Francis encyclical, Laudato Si, are studied through the Franciscan spirituality, with origins in medieval history, the Franciscan Rule, and a set of papal documents, alongside Laudato Si. These themes are important not only for the good of the Church but also for the contemporary world and for future generations. The primary objective is to highlight the important legacy left by Saint Francis, his understanding of evangelical poverty and to appreciate its relevance. From this study, the following points are relevant for consideration: evangelical poverty is reflected in the matter of acquiring goods and in the pastoral care developed in different places around the world where the Franciscan presence is seen at work; the relationship between evangelical poverty experienced by Saint Francis and the teachings of Pope. The methodology implemented included a selection of works relevant to the topic, the analyzation of these texts, the comparison of the main points regarding spirituality and pastoral care, the noting of any continuities and the understanding of how Franciscan spirituality rekindles and can help in the search for values or can be sustained with the papacy of Pope Francis. During his pontificate, Pope Francis released several documents and messages that reflect his direction of a poor Church that is concerned about those in most need. It follows the project that comes from Jesus Christ. This project is found in the document Laudato Si, and speaks of socio-environmental concerns, and the response of human beings living a life of happy sobriety. Moreover, the thesis also contributes to presenting a better understanding of Lady Poverty. In addition, evangelical poverty, followed by St. Francis of Assisi, is analyzed, and is based on several texts from the Old Testament and the New Testament. The thesis includes commentaries from several Franciscans that help us understand the developed legacy of poverty and serves as a legacy of continuity between the idea of Saint Francis and Pope Francis and texts from Pope Francis that serve as pathways for young people. In conclusion, this study deduces that there is a continuity between evangelical church poverty, embraced by Saint Francis of Assisi – Lady Poverty –and Laudato Si and the conversion of values with a life of happy sobriety. The indepth study confirms that the themes considered are important today in relation to the gospel, particularly for young people, in terms of searching for a better life, which in an essence would be a life with happy sobriety.