(b) The Church is able to give determinative interpretation of the Positive Divine Law--that is, to settle in what manner a law must be fulfilled. Examples: Christ gave the command that the Eucharist should be received, but it was the Church that determined when and how often one must receive Communion to comply with the wishes of Christ. Christ instituted only generically the essential rite of some Sacraments, leaving it to the Church to determine the rite more specifically. 360. The Law of Christ and Impossibility.--(a) Impossibility does not excuse from a law, in which an act is necessary not because it is prescribed, but is prescribed because it is a necessary means without which, even if one be not guilty of negligence, salvation cannot be had (necessity of means). Example: Infants who die without Baptism are not held guilty of neglecting the Sacraments, but lack of it deprives them of the supernatural bliss promised by Christ. Only Baptism confers regeneration, and only the regenerated are capable of the vision of God. (b) Impossibility can excuse from a law in which an act is necessary because it is prescribed, and which therefore makes one guilty of sin, if one willfully neglects it (necessity of precept). Example: An adult who dies without the Eucharist cannot be saved if he was guilty of grave negligence; but he can be saved, if it was not his own fault that he did not receive Holy Communion. The Eucharist increases supernatural life, but inculpable lack of it does not exclude from that life. 361. Impossibility--or what is called impossibility--does not always excuse even from those divine laws which have only the necessity of precept. (a) Physical impossibility is the lack of power to perform an act; for example, it is physically impossible for a blind man to read. This kind of impossibility, of course, excuses from guilt and punishment. Example: Titus is dying and thinks of the command that he should receive Viaticum. But he is unable to receive Communion without vomiting. Hence, in his case the impossibility excuses from the divine command. (b) Moral impossibility is the inability to perform an act without serious inconvenience; for example, it is morally impossible for one who has weak eyes to read small print. This kind of impossibility does not excuse, if a greater evil will result from the non-observance of the law than the evil of inconvenience that will result from its observance. Examples: Eleazer would not eat the meats forbidden by the law of Moses, preferring to die rather than give public scandal (II Mach., vii. 18). The command of Christ that pastors minister to their flocks obliges, even if it involves danger of death, when there is a great public necessity (as in time of pestilence) or an urgent private necessity (as when an infant is about to die without Baptism).