Antes era incapaz de decir 'no', pero aprendí a hacerlo para mi mayor tranquilidad

In Nacional, a personal development topic is being discussed. It involves learning to say "no" in order to achieve greater peace of mind. This skill is seen as important for maintaining self-esteem. Saying "no" is part of setting boundaries with others. Further information on this topic, including how to set limits with empathy, is available from El Mundo.