The Spirit Author embarks on a deep psychological analysis concerning the aspects of suffering and proposes the Spiritist solution, which encourages self-discovery, evangelical living and rational behavior - essential requisites for the attainment of plenitude. The different types of physical and mental suffering push the masses toward addictions, evasions of reality and despair. Considering the human quandary - the lack of self-knowledge - and taking into account the urgent factors that trigger suffering, the Spirit Author has sought to delve into a study of the topic, which she offers to the esteemed reader.