The thesis presents foundational principles of the educational activity of John Bosco, a pedagogue and theologist. Firstly, main highlights of Bosco's life are laid out summarizing his work and significance for pedagogical, philosophical and educational activity among children and the youth. His method of upbringing is specific because it is based on reason, faith and kindness. Furthermore, specifics are found in his commitment to the upbringing, i.e. an educator's role in every part of the educated's life. After a review of Bosco's pedagogy, an analysis of his system from a philosophical standpoint is given, which explains the link between upbringing and religion, i.e. Christianity. In this part Christian humanism is in the spotlight which is based on values and optimism which means to focus on a youngster's positive qualities. Bosco accepts the educated the way they are and puts all his efforts into understanding them. The goal of this master's thesis is to give an insight into John Bosco's educational and upbringing methods, as well as their importance, purpose and effectiveness. Bosco's educational system is put into the context of his time so as to facilitate its understanding. Namely, we're talking about the Industrial Revolution era when upbringing was neglected, and the children were on the margins of society as the victims of family issues and difficulties. John Bosco stood out as a man who has devoted all his life to children whose upbringing, education and the comfort of a home and family were denied. He enabled that to happen by founding oratories which later spread across the world. At the end a conclusion is made that Bosco's educational system calls for thought and review of educational intentions.