The great importance of the Suprema haec sacra is based on the fact that this letter sets forth in full explicitness some distinctions and explanations that had been clearly implied and forcefully taught in previous authoritative docuмents of the teaching Church, but which had never before been set forth in these authoritative pronouncements as explicitly as in the writings of the traditional Catholic theologians. Among these teachings are: (1) the statement that the Catholic Church is necessary for salvation with the necessity of means and with the necessity of precept; (2) the fact that when we describe an individual who is convinced that the Catholic Church has truly been established by Our Lord, and who still obdurately refuses to enter the Church, as being in a condition in which he cannot attain his eternal salvation, we are speaking of the Church's necessity of precept rather than of its necessity of means; (3) the explicit distinction between an explicit and an implicit will to enter the Church; (4) the outright assertion that a person who has merely an implicit will to enter the Church can be saved; and (5) the fact that no will or desire of entering the Church can be effective for the attainment of eternal salvation unless it is enlightened by true supernatural faith and animated by perfect charity. Fenton