The Doctrine of God the Sanctifier
The Faithful with the Saints and the Poor Souls
The Communion between the Faithful on Earth and the Saints in Heaven
#150 It is permissible and profitable to venerate the Saints in Heaven, and to invoke their intercession.
#151 It is permissible and profitable to venerate the relics of the Saints.
#152 It is permissible and profitable to venerate images of the Saints.
The Communion of the Faithful on earth and the Saints in Heaven with the Poor Souls in Purgatory
#153 The living Faithful can come to the assistance of the Souls in Purgatory by their intercessions (suffrages).