The Trinity - into whose life Mary was bodily inserted
Jesus’ Resurrection - shared with His Blessed Mother, and eventually with all of us
Salvation - begun in us purely by the grace of God, and brought to perfection through our lifelong cooperation
The Goodness of the Body - that it is not at odds with living a “spiritual life,” but is destined for glory
Sacred Tradition - by which we have explicit knowledge of Mary’s assumption
Sacred Scripture - by which we have implicit knowledge of her assumption (the image of Rev.12:1-2)
Papal Infallibility - which cemented our knowledge of it
The Communion of Saints - Mary being its most magnificent member and interceding for the Church on earth and in purgatory
The Eucharist - by which we give thanks to God and unite ourselves to Jesus’ death, resurrection, and ascension, just like Mary.
So do the quintessentially Catholic thing today and go to Mass. Blessed Feast of the Assumption to you!