Adam of Saint Victor wrote this in the twelfth century:
Of the Trinity to reason
Leads to license or to treason
What is birth [gigni] or what procession,
Is not mine to make profession,
Save with faith unswerving.
Thus professing, thus believing,
Never insolently leaving
The highway of our faith,
Duty weighing, law obeying,
Never shall we wander straying
Where heresy is death.*
*Cited in John Randall, The Making of the Modern Mind, who is citing Henry Adams, Mont-Saint-Michel and Chartres, 315.