Good Friday is part of what is known as Holy Week, starting off with Palm Sunday and leading through to Easter Sunday.
The 86-year-old was taken to the hospital on Wednesday for a respiratory infection, according to the Holy See.
Pope Francis has been hospitalised in Rome, where he will stay for several days, the Vatican said.
The Parthenon, Virgin’s Chambers, is one of the most famous ruins of Ancient Greece.
He condemned “terrible forms of exploitation, unworthy of humanity” in Congo, where vast mineral wealth has fuelled war, displacement and hunger.
The Congolese, the pope said in his homily, were suffering from “wounds that ache.”
After the morning mass, Pope Francis in the afternoon was due to meet victims of violence brought to Kinshasa from the east of the country.
The Pope said that the criminalisation of homosexuality was “unjust.”
Mr Achi was set ablaze by angry bandits after they were unable to gain entry to the parish residence where he dwelled.
The president lauded the deceased for advancing inter-faith dialogue and peace, adding that he will be remembered as a true servant of God.
