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"In mythology the rose is associated with Aphrodite the Greek goddess of love who was often depicted adorned with roses around her head, feet and or neck. It is also said that a rose bush grew within the pool of blood spilled from Aphrodite’s slain lover Adonis. In Christian mythology, a rose bush was also said to have grown at the site of Christ’s death.
In the Tarot the rose is considered a symbol of balance. It expresses promise, new beginnings, and hope. Its thorns represent defense, physicality, loss, thoughtlessness. In the major arcana the rose appears on the Magician, Strength, Death and Fool cards. All of these cards hold strong meanings of balance and equilibrium.
In the classical era, the rose was sacred to a number of goddesses including Isis. The ancient Greeks and Romans also identified the rose with the goddesses of love, Aphrodite and Venus respectively. In Rome a wild rose would be placed on the door of a room where secret or confidential matters were discussed. The phrase sub rosa, or “under the rose”, means to keep a secret and is derived from this ancient Roman practice.
Christians in Medieval times identified the five petals of the rose with the five wounds of Christ. The rose later became associated with the Virgin Mary and was eventually adopted as a symbol of the blood of the Christian martyrs. A bouquet of red roses is used as a gift on Valentine’s Day which is a day celebrating the Christian Saint Valentinus."
https://www.flowermeaning.com/rose-flower-meaning/