Divine Power

Divine power is one of the three methods of channeling magic for the people of Thaerrathas.
All magic relates to channeling energy of Souls, primarily dealing with manipulating the Souls of the natural world around you, but it can also include your own Soul or the Souls of other creatures. Divine power relates to unleashing the power of your Souls or the Souls around you. Clerics, Paladins, and Artificers fall under practitioners of Divine Power, additionally Monks who have access to magical abilities could fall under this category.
This article isn't meant to constrain how player choice, but rather to make it clear how certain Spellcasters are seen by the world around them.
Clerics pray and commune with a Higher Being. These Higher Beings use Arcane Power to unleash the power of the Soul of the Cleric and the souls of those around the Cleric. Much of what the Cleric does is an attempt to understand the whims of a Higher Being to appease them into bestowing blessing.
Paladins believe in something. It is the strength of their convictions that unleashes their Divine power. They directly channel their own Soul, tapping into a power within themselves and unleashing it upon the world as well as unleashing power within the souls of others. Many Paladins fight in the name of an individual or faction they believe in. 
Artificers study and experiment with the materials that house the spirits of the natural world. Artificers then shape said materials to unlock the true potential of the spirit within. The methods of the Artificer are thought to be the oldest practices of magic on Thaerratha as the magical crafts that the Artificers employ parallel magical artifacts from civilizations lost to the mists of time.