Final answer:
Every member of the Church shares the vocation of being a priest and has the responsibility to participate in the spiritual life of the Church.
Step-by-step explanation:
The vocation that every member of the Church shares is the role of being a priest. According to the Bible, all Christians are considered to be part of a 'royal priesthood' (1 Peter 2:9) and have the ability to serve as priests. This means that every Christian has the responsibility to participate in the spiritual life of the Church, including worship, prayer, and offering spiritual guidance to others.