159 At the Paschal season, which commemorates the triumph of Christ, our souls are filled with deep interior joy: we, accordingly, should also consider that we must rise, in union with the Redeemer, from our cold and slothful life to one of greater fervor and holiness by giving ourselves completely and generously to God, and by forgetting this wretched world in order to aspire only to the things of heaven: "If you be risen with Christ, seek the things that are above . . . mind the things that are above."
Source: Mediator Dei (Vatican.va)