I. To the Question

65. I reply: this sacrament should not be so repeated that it is done knowingly, because he who repeats it knowingly sins mortally; but neither can it be so repeated that it have, when iterated, its proper efficacy.

66. The principal reason is divine institution.

67. There is a congruity, because someone is by this sacrament instituted in a determinate rank in the Church, namely in the rank of a warrior; and a sacrament that puts one in a determinate rank is not repeated.

68. And next to this is adduced another congruence, that it impresses an indelible effect, namely a character.