After sharing her concern, Mitra watched anxiously as the fortune-teller thumbed through the thick tome, opened it on a random page and pointed his finger at one verse.

He read it out and then explained its metaphors and mystical insights. Mitra’s face lit up – the message was positive, and domestic harmony lay ahead.

“I finally did the consultation today for my son, because I had doubts on whether his marriage was a good decision,” she said in the garden of the Hafez mausoleum.

After the nod of approval for her daughter-in-law from within Iran’s ancient lyrical treasure trove, she said, “I finally regained hope”.

Some Iranian fortune-tellers, known as falgir, offer a special service to truly randomise the selection of the all-important Hafez verse.

Chirpy parakeets known as “love birds” hop across stacks of colourful envelopes that contain his enigmatic poems and pick one out with their tiny beaks.

Poetry enjoys immense popularity in Iran, where timeless verses on love and spirituality can be found woven into carpets, engraved in jewellery and emblazoned on street billboards. Early 20th-century poetry gave voice to social protest and faced censorship under the former monarchy.

But no Iranian poet has enjoyed enduring and universal adoration like Hafez, and a well-worn copy of his Divan compendium is found in most households.

People from all walks of life regularly cite his lyrical wisdoms, mostly on the themes of love and wine and ironic takes on the hypocrisy of holy men.

His poetry is recited during Nowruz, the New Year, and other celebrations such as the winter solstice festival.

“We start the year with the poems of Hafez,” said Maryam Youssefi, a 46-year-old housewife, for advice on what it “has in store for us”.

Fortune-tellers who interpret Hafez can be found across Iran, but especially at his tomb, set amid rose gardens in Shiraz, 800 kilometres (500 miles) south of Tehran.

Hafez lived during a turbulent era of Persia’s history, and his contemplative verses often spoke of pain and human suffering as well as religious hypocrisy.

His influences can be found far beyond Iran in the works of Johann Wolfgang von Goethe and Ralph Waldo Emerson, among others.

Hafez has remained a venerated figure after the 1979 Islamic revolution, even if some senior clerics have voiced disapproval of using Hafez’s ancient wisdoms for divination and guidance.

In recent years, one criticised it as out of line with Islamic sharia law and urged people against “following Hafez’s divinations”.

Nonetheless, devotees keep flocking to Shiraz, and Hafez poetry reading sessions still draw large crowds, while the divination custom remains alive and well.

Many Iranians swear by it while others “practise the tradition without really believing in it”, said Ahmad Akbarpour, a writer and poet from Shiraz.

Mostafa Eskandari, a 67-year-old fortune-teller, says he learned Hafez’s poetry by heart and has been interpreting it for over 30 years.

“Hafez’s poems are ambiguous and multifaceted. They can be interpreted in different ways,” he says.

Yet the master of old speaks to everyone individually, says Eskandari.

“If a thousand people each set an intention and open the book of odes together, each will receive a different response.”