132 On 17 May 1906, the same day in which Brother Charles, alone, could no longer celebrate Mass, he wrote of his promise “to let the heart of Jesus live in me, so that it is no longer I who live, but the heart of Jesus that lives in me, as he lived in Nazareth”. His friendship with Jesus, heart to heart, was anything but a privatized piety. It inspired the austere life he led in Nazareth, born of a desire to imitate Christ and to be conformed to him. His loving devotion to the heart of Jesus had a concrete effect on his style of life, and his Nazareth was nourished by his personal relationship with the heart of Christ.
Source: Dilexit Nos (Vatican.va)