26 Finally, We recur again to what We have already declared and We insist upon it most solemnly; viz., that whatever projects individuals or associations form in this matter should be formed under episcopal authority. Let them not be led astray by an excessive zeal in the cause of charity. If it leads them to be wanting in proper submission, it is not a sincere zeal; it will not have any useful result and cannot be acceptable to God. God delights in the souls of those who put aside their own designs and obey the rulers of His Church as if they were obeying Him; He assists them even when they attempt difficult things and benignly leads them to their desired end. Let them show, also, examples of virtue, so as to prove that a Christian is a hater of idleness and self indulgence, that he stands firm and unconquered in the midst of adversity. Examples of that kind have a power of moving people to dispositions of soul that make for salvation, and have all the greater force as the condition of those who give them is higher in the social scale.
Source: Graves de Communi Re (Vatican.va)