18 But, says he, the name of Christ is of great advantage to faith and the sanctification of baptism; so that whosoever is anywhere so-ever baptized in the name of Christ, immediately obtains the grace of Christ: although this position may be briefly met and answered, that if baptism without in the name of Christ availed for the cleansing of man; in the name of the same Christ, the imposition of hands might avail also for the reception of the Holy Spirit; and the other things also which are done among heretics will begin to seem just and lawful when they are done in the name of Christ; as you have maintained in your letter that the name of Christ could be of no avail except in the Church alone, to which alone Christ has conceded the power of heavenly grace.
Source: The Epistles of Cyprian (New Advent)