Cardinal Peter Kodwo Appiah Turkson of Ghana celebrates the thanksgiving Mass at the Vatican for the promulgation of the decree of venerability for Cardinal Nguyen Van Thuan on Sept. 15, 2017. INSET: Cardinal Nguyen Van Thuan is pictured between 2001-2002.

COMMENTARY: The Vietnamese cardinal, who died 20 years ago Sept. 16, is one of the greatest Eucharistic witnesses of modern times.