Final answer:
According to traditional Catholic doctrine, it is true that sacraments are necessary for salvation, providing the means of grace that lead to sanctification and saving faith.
Step-by-step explanation:
According to Thomas Aquinas and traditional Catholic doctrine, sacraments are indeed necessary for salvation. This is because the sacraments are seen as the primary means of grace by which believers are sanctified and saved. Among the most important sacraments are baptism, which purges the original sin; communion, which connects the believer spiritually with God through the act of transubstantiation; and confession, which is necessary to receive forgiveness for sins. These sacraments are considered essential acts to achieve spiritual salvation in the Roman Catholic tradition.