John, however, was less than happy with his lifestyle. He resigned most of his benefices to concentrate on a single chaplaincy in the city of Burgos. His preaching and his way of life had a great effect in people and he was becoming well known in the city. Conscious, however, of his own spiritual and intellectual needs he moved to the university city of Salamanca. While undertaking studies in theology and canon law he was also able to experience the pastoral ministry, especially in the pulpit and confessional, making a name for himself in a city of great social problems and civil unrest. After completing his studies he was prevailed upon to remain in Salamanca and was appointed official preacher to the city. His example and life-style added power and efficacy to his words.
Serious illness intervened and John made a vow to enter Religious Life on his recovery. This he was to do in 1463 when he was accepted as a novice in the Augustinian priory in the city at the age of thirty-three. A year later, on St Augustine’s Day, 28th August 1464, John made his religious profession as an Augustinian. He was able to continue his priestly ministry now from St Augustine’s Priory. That ministry, in particular his preaching, was to make a deep and lasting impression on Salamanca at a critical time in the history of the famous city. John became particularly well known as a peacemaker and reconciler of enemies among the nobles and factions of the city. He was also a fearless defender of the rights of the disadvantaged, even at considerable risk to himself, and was a staunch supporter of worker’s rights. He had no hesitation in publicly criticising the abuses of the powerful on the frequent public scandals of the upper classes.
John’s own spiritual life involved strict adherence to the Rule of St Augustine but without attracting undue attention to himself. He was known for his deep Eucharistic devotion and his special reverence for the Mass. In 1471 and again in 1477 he was elected prior of the Salamanca house and provincial councillor. While leading his community by word and example he was also able to continue his pastoral outreach in the city of Salamanca, in particular his work for reform and reconciliation.
By mid-1479 John’s health was deteriorating rapidly and he grew very weak. There was a rumour about the city that he had been poisoned by a lady who was upset and personally affected by his preaching against the public vices of the time. Whatever the truth of that rumour, John died on 11th June 1479. He was beatified over a century later, in 1601, and canonised by Pope Alexander VIII in 1690. His remains are venerated in the cathedral in Salamanca where he is honoured as patron of both diocese and city.