A rose is beautiful but it has thorns which symbolize pain.

"And thy [Mary's] own soul
a sword shall pierce,
that, out of many hearts,
thoughts may be revealed."

(Lk 2:35)

Simeon here inspired by the Holy Spirit revealed to Mary a premonition of suffering and at the Cross her suffering became complete as we sing the Stabat Mater,

Please click to hear and sing

"Through her heart, His sorrow sharing,
All His bitter anguish bearing,
Now at length the sword has pass'd."

Mary's suffering is mystical because it's in the order of divine love. It was not a suffering without meaning, nor a suffering to be endured because it was inevitable. Mary by her Fiat accepted the Incarnation with all that this event implied, that is, the suffering of Jesus for the salvation of mankind. Therefore, she suffered implicitly with her Son for the redemption of the world.

"Declaring the power of salvific suffering,
the Apostle Paul says:
'In my flesh I complete what is
lacking in Christ's afflictions
for the sake of his body, that is, the Church.' . . .
Thus to share in the sufferings of Christ
is to suffer for the kingdom of God."
(Pope John Paul II Salvifici Doloris)

If St. Paul can say this of himself, how much more can this be said of Mary. Her suffering in union with Christ has a secondary but profound influence on the salvation of the world far beyond the suffering of any Christian and even of all Christians till the end of time. Pope John Paul II eloquently states the following:

"The suffering of this mysterious new Daughter of Sion, Mary, is a result of the innumerable sins of all Adam's children, sins that have caused our expulsion from Paradise.

In Mary, therefore, in a unique way, there is revealed the salvific mystery of suffering, and the significance and fullness of human solidarity. Because the Virgin did not suffer for herself, being All Beautiful, the Ever Immaculate One: she suffered for us, in so far as she is the Mother of all. Just as Christ "bore our infirmities and endured our sufferings" (Is. 53:4) so also Mary was weighed down as by the sufferings of childbirth through an immense motherhood that makes us reborn to God. The suffering of Mary, the new Eve, alongside the new Adam, Christ, was and still is the royal path to the reconciliation of the world."

Please click to hear and sing

"Let me share with thee His pain,
who for all my sins was slain,
who for me in torments died."

Mystical Glory