Whether it is essential to this sacrament that the chrism which is its matter be previously consecrated by a bishop?

Objections

Objection 1 : It seems that it is not essential to this sacrament, that the chrism, which is its matter, be previously consecrated by a bishop. For Baptism which bestows full remission of sins is not less efficacious than this sacrament. But, though the baptismal water receives a kind of blessing before being used for Baptism; yet this is not essential to the sacrament: since in a case of necessity it can be dispensed with. Therefore neither is it essential to this sacrament that the chrism should be previously consecrated by a bishop.
Objection 2 : Further, the same should not be consecrated twice. But the sacramental matter is sanctified, in the very conferring of the sacrament, by the form of words wherein the sacrament is bestowed; hence Augustine says (Tract. lxxx in Joan.): "The word is added to the element, and this becomes a sacrament." Therefore the chrism should not be consecrated before this sacrament is given.
Objection 3 : Further, every consecration employed in the sacraments is ordained to the bestowal of grace. But the sensible matter composed of oil and balm is not receptive of grace. Therefore it should not be consecrated.