The Holy Sacrifice of the Mass celebrates what is occurring in heaven. Altar servers reflect the heavenly Mass in an earthly manner, which gives focus and meaning to all the promptness and reverence  that altar servers give. Altar servers reflect the service of the angels and saints in heaven to Christ at the altar. The altar server reflects the true reality that is already occurring, which gives a deeper meaning  and understanding of why the altar server is reverent. They receive special training to understand the reality of the Mass and become familiar with the names of the objects on the altar.