Relic with dried heart of Teresa of Avila. To venerate the relics of the saints is allowed in the Catholic faith.
Nuns kissing relic with bones of Teresa’s hand. Dictator Francisco Franco had relic of hand until his death.
There are other stories, e.g. Magdalena of the Cross (1487–1560), a mystic of outstanding piety & much prestige across Spain, who experienced same ‘spiritual ecstasies’, visions, levitation, stigmata, etc., but before dying confessed (30 years after becoming a nun), that she had made a pact with the devil! But nobody knew or noticed any difference for so many years, because her manifestations were exactly the same as the rest of the Catholic mystics.
She was 62 (1577) when wrote in less than 6 months, her book called ‘The Mansions‘ or ‘The Inner Castle‘ in obedience to an assignment given by her spiritual leaders. The first paragraph is her complaining about that. Later she saidd got the vision of a crystal globe with 7 mansions (& even more mansions) with God in the center.
The book is a guide to spiritual purification, describing the soul as a castle with 7 mansions, on the path to a mystical union/marriage with the divine ‘Majesty’ in the center or innermost mansion. She wrote that by emptying oneself of all attachments to creatures, God then comes and fills the soul with Himself, but this is Catholic doctrine about sin & purgatory, CCC #1472. At the end of the journey the soul would reach Spiritual Marriage in the 7th Mansion, the souls is free from sin & have union with God.