γ) For precisely the same reasons no man can be _metaphysically_ certain of his own justification. Hence there remains only _moral_ certainty. Moral certainty admits of varying degrees. The highest degree of moral certainty concerning justification can be had in the case of baptized infants, though, of course, we can never be metaphysically certain even in regard to them, because there is always room for doubt as to the intention of the minister and the validity of the matter and form employed in the administration of the sacrament. In the case of adults, certainty regarding justification varies in proportion to the measure in which it can be ascertained whether one has complied with all the requirements demanded by God. However, certainty may be so great as to exclude all reasonable doubt. St. Paul says: “I am sure that neither death nor life ... shall be able to separate us from the love of God, which is in Christ Jesus our Lord.”(1172) And St. Augustine: “What do we know? We know that we have passed from death to life. Whence do we know this? Because we love our brethren. Let no one ask another. Let each question his own heart; if he there finds fraternal charity, let him be sure that he has passed from death to life.”(1173) This teaching has led theologians to set up certain criteria by which the faithful may be relieved of unreasonable anxiety and obtain some sort of assurance as to the condition of their souls. Such criteria are: a taste for things spiritual; contempt of earthly pleasures; zeal and perseverance in doing good; love of prayer and pious meditation; patience in suffering and adversity; a fervent devotion to the Blessed Virgin Mary; frequent reception of the sacraments, etc.(1174) *Thesis II: Sanctifying grace admits of degrees and therefore can be increased by good works.* Both propositions contained in this thesis are _de fide_.