This talk was given as part of the philosophical activities of the main centre of New Acropolis in Madrid, by teacher and writer Miguel Ángel Padilla, author of the book “A Course in Stoicism”. The talk focused on presenting the tools used by the Stoics to develop inner strength, discernment and the ability to direct our existence in the best possible way, integrating these different aspects into a harmonious whole that helps people become more complete, serene and happy.