The distinction between light and vehement suspicion was somewhat nebulous. Like everything else in the vague region of morals, it was incapable of accurate definition, and each case had to be decided on its own merits, according to the temper of the judges. Alberghini's attempted test of infrequent or habitual performance of acts inferring suspicion fails utterly in practice and moreover leaves unsettled the more important and common class of cases where testimony was insufficient for conviction and yet too strong for acquittal.[325] Moreover, suspicion might be modified by exterior circumstances, as when Miguel Calvo tells us that, with Moriscos, however slender may be the suspicion, it must be treated as vehement.[326] It was evidently impossible to prescribe any absolute rule, and it is to the credit of the Inquisition that it rarely pronounced suspicion to be vehement, while light suspicion occurs in almost all sentences short of reconciliation. Thus, in the Toledo record from 1648 to 1794, there are three hundred and fourteen abjurations _de levi_ and only fifty-one _de vehementi_--or about an average of one every three years.[327]
Whatever other punishment might be visited on suspicion, abjuration of heresy in general, and especially of the heresy suspected, was indispensable. This could be administered either in the audience-chamber, or in a public auto de fe, and was an impressive ceremony. In the face of a cross and with his hand on the gospels, the culprit swore that he accepted the Catholic faith and detested and anathematized every species of heresy, and especially that of which he was suspect. He pledged himself always to keep the faith of the Church and to be obedient to the pope and the papal decrees. He declared that all who opposed the Catholic faith were worthy of condemnation, promising never to join them, but to persecute them and denounce them to prelates and inquisitors. He swore to receive patiently and humbly all penance imposed on him, and to fulfil it with all his strength. If the abjuration was for light suspicion, he consented and desired that, if he failed in any part of this, he should be held as impenitent and he submitted himself to the correction and severity of the canons, so that the penalties prescribed in them should be executed on his person, and finally he called upon the notary to record it and on all present to serve as witnesses. If the abjuration was for vehement suspicion, he consented and desired that, if he failed in his promises, he should be held and considered as a relapsed and suffer the penalties provided for relapse. This was the difference between abjuration _de levi_ and abjuration _de vehementi_, so often alluded to above, and it was of no small import under the canons. After the former, reincidence in the offence entailed no special penalty; it was at the discretion of the tribunal merely to repeat the previous sentence, or to aggravate it, as the case might appear to deserve. But, after the latter, reincidence was relapse, for which the canons decreed irrevocable burning, _ipso facto_ and without trial. To impress this on the penitent, his abjuration _de vehementi_ was written out and he was made to sign it. Then, on the next day after the auto de fe, he was brought into the audience-chamber, it was read to him and he was warned to observe its conditions for, if he should again fall into any heresy whatever, he would be treated as a relapsed without mercy, and it would be the same if he did not perform the penance imposed.[328]