(d) Compensationism, whose doctrine is: “When one is undecided between the safer and the less safe, one may choose the less safe whenever it is certainly and solidly probable, and there is a proportionate reason to compensate for the risk taken.” 683. Probabiliorism.--The arguments in favor of Probabiliorism are as follows: (a) extrinsic or from authority. This system is more ancient, and, when the controversy over systems began in the seventeenth century, this was the one that was most favored by the Church and theologians; (b) intrinsic and direct. An essential note of certitude is that it should exclude all doubt, for as long as doubt remains there is only opinion. But one who is undecided cannot exclude all doubt, unless the arguments against the doubts not only balance, but outweigh the latter (i.e., unless one has greater probability on one’s side). Hence, he who acts against the safer, which is always certain enough, when his own opinion is not more probable, acts with an uncertain conscience; (c) intrinsic and indirect. In all other matters a man is not prudent if he assents to that which is less safe and less probable. Thus, in things speculative no scholar would think of accepting a theory which to his knowledge was further removed from the truth; in things practical no man of common sense would prefer a road that seemed less likely to lead to his destination. But we should not be less prudent about the good than we are about the true and the useful. Hence, in doubt we should always decide in favor of the law, unless the arguments for liberty are more convincing. 684. The answers given to the above arguments are: (a) Probabiliorism is not more ancient as a system, since none of the moral systems were formulated before the sixteenth century; if Patristic and medieval authorities can be quoted who decided cases probabilioristically, others who were contemporary can be named who decided according to milder principles. Moreover, the passages cited are frequently obscure, and do not necessarily bear a Probabilioristic sense. That Probabiliorism enjoyed more favor at the beginning of the controversy is not wonderful, since other systems were more or less identified with Laxism, and the question at issue had not been studied thoroughly. Today Probabiliorism has few defenders.