Baptism forgives all personal sin, takes away original sin (but leaves concupiscence, a tendency toward sin), infuses sanctifying grace, and is necessary for salvation. Baptism imprints in the soul a character, a certain spiritual and indelible Sign, and so can only be received validly once. Persons of any age may be baptized, from infant to adult. Only the baptized may receive the other Sacraments. The grace received by baptism may be lost by the commission of an actual mortal sin.