Mystics do not consider the Powers bestowed on them as ‘spells.’ (THOSE are employed by witches and sorcerers!) Rather they are manifestations of Divine Power, and refer to them as ‘Powers’ ‘Prayers’ or ‘Miracles.’
Prayers, Powers and Miracles are far more powerful then Orisons. And while all Mystics can perform Orisons, only the most Devout, Enlightened and Experienced can perform these greater acts. The more enlightened and experienced the Mystic the more they are able to perform.
Lesser Prayers
In general, these conform to 1st level spells
Greater Prayers
In general, these conform to 2nd level spells
Lesser Powers
In general, these conform to 3rd level spells
Greater Powers
In general, these conform to 4th level spells
Lesser Miracles
In general, these conform to 5th level spells
Miracles
In general, these conform to 6th level spells
Greater Miracles
In general, these conform to 7th level spells