It was a cold morning at 6 a.m. one day in the early 1960s when I first met the late Msgr. William J. Rodgers as an altar boy for Mass in St. Patrick’s Church, Kent Ave., Fort Greene.   “Introibo ad altare Dei. Ad Deum qui laetificat juventutem meam.” He was praying the Tridentine Mass in beautiful ecclesiastical Latin, and I was a Latin newbie fascinated by the language and the ritual of the Mass.