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Hebrews 9:28 says Christ died once for all. How then is there room for the Mass?

It is one thing for Christ to earn all forgiveness and grace, another for a person to take it in - person must be disposed, open. For this, he must be a member of Christ and like Him. Cf. the syn Christo theme. esp.Rom 8:17:"We are heirs with Christ, provided that we suffer with Him, so we may also be glorified with Him."