The Holy Office Letter states.
But it must not be thought that any kind of desire of entering the Church suffices that one may be saved. It is necessary that the desire by which one is related to the Church be animated by perfect charity. Nor can an implicit desire produce its effect, unless a person has supernatural faith: "For he who comes to God must believe that God exists and is a rewarder of those who seek Him" (Heb. 11:6). The Council of Trent declares (Session VI, chap. 8): "Faith is the beginning of man's salvation, the foundation and root of all justification, without which it is impossible to please God and attain to the fellowship of His children" (Denzinger, n. 801).
And many mistakenly take that to mean or to be an endorsement of the opinion that explicit faith in those two articles alone suffice for salvific supernatural faith. Some that it to mean that and accept and others take it to mean that and reject that. But the letter evidently doesn't say that.
In regards to the Denzinger quote above from Cardinal Marchetti-Selvaggiani's letter to Archbishop Cushing of Boston, called Protocol 122/49, Fr. Wathen states:
...."He says: "just any kind of vague desire" (
"quodcuм que Votum") is insufficient to effect one's implicit membership in the Church. But an implicit desire is a
quodcuмque votum!
He says this
Votum must be informed by perfect charity. Perfect charity is the love of God primarily for His own sake. We are prompted to ask: How does one know when one possesses such charity? The [EENS] doctrine maintains that the evidence for it in one's soul is one's accepting the Faith and entering the Church. If one does not do this, it is vaporous speculation to suggest that one possesses it.
He says: "This implicit desire" (
"Votum") will effect nothing, unless one has supernatural faith. We ask: How can one have supernatural faith in that of which one is invincibly ignorant? It is impossible.
............By the time the Cardinal has finished his commentary, any enquirer would be satisfied that he himself qualified for salvation, since he is an easy-going sort of fellow, who believes in Jesus Christ as much as other people, and doesn't ever harm his neighbor. He would gladly join the Catholic Church if he could see any need for it; but this official Catholic statement indicates that it is no urgent matter."