“Except in special circumstance, a Templar mage is not trained, but raised.
Equally (indeed, perhaps more) important as skill in such mages is absolute loyalty to the Templar Order–something that cannot be properly nurtured in adults, as such potentials must chosen before rebellious natures are developed. Circle-born mages are almost always given to the cause, where they learn to become obedient to the Order well before they learn to walk or talk.
The first such case is the youngest of Knight-Captain Faulkner’s charges: Enchanter Haylan (then 17 winters), born of a union between a Templar and a mage woman. Her future as a hunter of her own kind was decided even before her birth, and she would be trained for 16 more years before the Templar Hound initiative could begin in earnest. Raised first in the Starkhaven Chantry and immediately given to the Circle at the first sign of magic, Enchanter Haylan has been under the Templar’s eye all her life and knows little outside of the Circle.
There had been some scandal when it was rumoured that in preparation for the Templar Hound initiative, the Order turned a blind eye to (and some would suggest even encouraged) cases of Templar and mage relations for several years in order to produce mages of the desired circumstance. It is unknown if Enchanter Haylan was a product of a mere dalliance or purposeful breeding.”
–From In Pursuit of Knowledge: The Travels of a Chantry Scholar, by Brother Genitivi