The Refutation of All Heresies

After we have, not with violence, burst through the labyrinth of heresies, but have unravelled (their intricacies) through a refutation merely, or, in other words, by the force of truth, we approach the demonstration of the truth itself. For then the artificial sophisms of error will be exposed in all their inconsistency, when we shall succeed in establishing whence it is that the definition of the truth has been derived. The truth has not taken its principles from the wisdom of the Greeks, nor borrowed its doctrines, as secret mysteries, from the tenets of the Egyptians, which, albeit silly, are regarded among them with religious veneration as worthy of reliance.

Nor has it been formed out of the fallacies which enunciate the incoherent (conclusions arrived at through the) curiosity of the Chaldeans. Nor does the truth owe its existence to astonishment, through the operations of demons, for the irrational frenzy of the Babylonians. But its definition is constituted after the manner in which every true definition is, viz., as simple and unadorned. A definition such as this, provided it is made manifest, will of itself refute error.

And although we have very frequently propounded demonstrations, and with sufficient fullness elucidated for those willing (to learn) the rule of the truth; yet even now, after having discussed all the opinions put forward by the Greeks and heretics, we have decided it not to be, at all events, unreasonable to introduce, as a sort of finishing stroke to the (nine) books preceding, this demonstration throughout the tenth book.