Yoga belongs to the philosophical system of classical India. Its vision of life implies a process of inner liberation which is completed with the realization of the self and the infinite bliss that ensues. This process develops a detailed study of the self and a deep analysis of the most profound existential questionings. That undertaking involves determination and perseverance and, for this reason, necessitates seriousness from the individual engaged in it, a trustworthy guide in order to accompany them throughout and the aphorisms of Patanjali which act as precious landmarks along this lengthy inner journey. Perine Andre