Deeply involved with the language and its culture, passionately committed to the best things in Welsh life, there is in his work - even at moments of high intensity - an element of detachment, an ability to step aside and see the wonder of Wales, its beauty and its tragedy, with an outsider's reflective, almost analytical gaze."
He had a regular column in the Welsh-language magazine of the Evangelical Movement of Wales, Y Cylchgrawn Efengylaidd, discussing the Christian heritage of Welsh literature.
Many Welsh scholars such as R Tudur Jones contributed through support for pressure groups such as Cymdeithas yr Iaith Gymraeg.
[citation needed] Jones was a supporter of such campaigns, but his major contribution to promoting the language was in teaching Welsh to adults.
In adult teaching, he was the founder of CYD: Cymdeithas y Dysgwyr (Learners' Society), which arranges night classes in Welsh throughout Wales, and remained its honorary President until his death.