By starting from a series of practical manuscript manualsproduced by Spanish inquisitors for daily use in their work, then followingtheir references to Latin legal treatises, it is possible to gain a betterunderstanding of the theoretical, theological, philosophical, and pastoralunderpinnings of inquisitorial practice. Further information can be gleaned bycomparing the procedural structure of trials with the relaciones de causas, the reports that summarizedthose trials and justified inquisitors’ decisions to their superiors. Thisdouble approach reveals that the inquisitorial trial of faith can beconceptualized on two different levels: the formal judicial proceedings thatshaped the organizational sequence of the trial, and another process thatfollowed a less explicit internal logic and sought to produce a penitentialrather than a judicial truth. Though less evident for modern readers of theInquisition’s archives, this second level formed a key part of the theoreticalapparatus described in the Latin treatises. The first level was repressive and,once the offense was proved in conformity with all judicial forms, imposedpunishment. The second was integrative and ecclesiastic, and aimed toreintegrate defendants into the fold of the Catholic Church even when foundguilty. The inquisitors mobilized these two levels with a certain flexibilitythat has not always been evident to historians: seen from this angle, theirexpressions of interest in defendants’ spiritual well-being were more thansimple hypocrisy. The two conflictual logics nevertheless meant that theinquisitorial trial of faith was an unbalanced edifice that could easily sway inone direction or the other, depending on the inquisitors’ choices. Over time, itappears that the penitential aspect of the trial took precedence over the purelyjudicial dimension. There are several indications that a similar double logicgoverned the criminal trials of other jurisdictions, meaning that such anapproach may shed a broader light on early modern institutions and theirresolution of conflicts.