[2] His nationalistic stance, combined with Calvinist doctrine, created an integrated vision that was significant to the religious life of Christian Wales in the later half of the 20th century.
Christian faith was the foundation of family life as his parents experienced the spiritual zeal of the 1904–1905 Welsh Revival.
Though being raised as a Christian, it is said that the turning point in his life was when he heard D. Martyn Lloyd-Jones preach at an evangelistic crusade at Rhyl Pavilion where he believed he encountered God.
Returning from Oxford in 1948, now married, Jones was ordained as minister of Seion Welsh Congregationalist Chapel, Aberystwyth.
Jones not only contributed to Wales at a spiritual level but also got involved in the nationalist struggle through his leadership role in Plaid Cymru and his support of Cymdeithas yr Iaith Gymraeg (the Welsh Language Society).