At every Mass, we enter into the mysteries of salvation after the manner of a sacrament. However, during the Triduum (Holy Thursday, Good Friday, Easter Vigil) we enter into these mysteries after the manner in which they were historically accomplished. That is to say, we re-live these mysteries in a more "dramatic" fashion than at any other time in the liturgical year - following the Lord's footsteps through his Passion and Resurrection.
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