In the theology of The Church of Jesus Christ of Latter-day Saints, the spirit world is understood as a realm where spirits reside between death and resurrection. This intermediate state is not one of inactivity; rather, it is a dynamic environment where spirits continue to learn, teach, and progress.

Brigham Young, the second president of the Church, emphasized the active nature of the spirit world. He taught that upon departing from mortal life, individuals enter the spirit world, where they engage in familiar and natural interactions. Spirits in this realm are active and do not sleep; they converse and communicate as naturally as they did in mortality. This perspective underscores the belief that the spirit world is a place of ongoing activity and progression.¹⁷¹

A pivotal event in the spirit world is Jesus Christ's ministry between His death and resurrection. Holding the keys of the Gospel, Christ was the first to preach to the spirits in prison, opening the door of salvation to them. This act initiated the preaching of the gospel in the spirit world, allowing spirits who had not received the gospel in mortality to hear its message.¹⁷²

The spirit world is divided into two conditions: paradise and spirit prison. Paradise is the dwelling place of righteous spirits who have been faithful to the testimony of Jesus during their mortal lives. Spirit prison, on the other hand, is the state of those who have not yet received the gospel or who rejected it in mortality. In this context, spirits retain their agency and can be influenced by both good and evil. As they learn gospel principles and choose to live according to them, they have the opportunity to progress. Spirits in paradise can teach those in spirit prison, facilitating their growth and progression.¹⁷³

While the gospel may be accepted by spirits in the spirit world, the ordinances of salvation must be performed for them on earth. This is accomplished through vicarious temple ordinances, such as baptisms for the dead, performed by living individuals on behalf of deceased persons. These ordinances are essential for the salvation of those who accept the gospel in the spirit world, enabling their continued progression.¹⁷⁴

The spirit world in Latter-day Saint theology is a place of continued growth and progression. Through the preaching of the gospel, the exercise of agency, and the performance of vicarious ordinances, spirits have the opportunity to advance and prepare for their eventual resurrection and judgment.