The double truth is a current that considers the reasonings and revelations (fruits, reason and others of faith or pagan myths) as true to both, although they may be contradictory. So in that current of thought it is posited that there is a double truth.
Commonly attributed to the Cordovan philosopher Averroes (1126-1198), he never really defended that theory, since he considered that truth was one, which could be reached by several roads or ways. In order to save the incompatibility of the Averroist theses with Christian doctrine, Siger de Brabant proposed the doctrine of the double truth, according to which there is a religious truth and a philosophical and scientific truth. This doctrine would be adopted by most European defenders of Averroism.
St. Thomas Aquinas (1225-1274) also opposed; for him, faith is a divine grace that God gives to men who choose and reason also comes from God, but as a faculty more distributed than faith (all men are right, but not all have faith). St. Thomas says: "Philosophy and theology are two distinct but uncontested disciplines, they converge in the preambles of faith and both complement each other and lend each other mutual assistance (reason with their dialectical weapons, faith as the extrinsic criterion) in the search for the truth.
William of Occam (1298-1349), puts an even greater distance between the veracity of reason and faith (see Occam's razor).
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