A prolific writer, Williams wrote poetry and prose including the well known Tract: "On Reserve in Communicating Religious Knowledge".
The Williams family had a home, Cwmcynfelin, in Llangorwen, Cardiganshire, from which Isaac would walk to Oxford and other destinations.
He was educated at Harrow School and Trinity College, Oxford, where as an undergraduate he gained the Latin verse prize and thus came to the notice of John Keble.
Williams in Tract LXXX, "On Reserve in Communicating Religious Knowledge" had espoused a distinctly Catholic position.
[1] In 1842 Williams married Caroline Champernowne and the couple moved to Bisley, Gloucestershire, where he worked as a curate to Thomas Keble.