40 Finally, let us consider the saints, who exercised charity in an exemplary way. Our thoughts turn especially to Martin of Tours († 397), the soldier who became a monk and a bishop: he is almost like an icon, illustrating the irreplaceable value of the individual testimony to charity. At the gates of Amiens, Martin gave half of his cloak to a poor man: Jesus himself, that night, appeared to him in a dream wearing that cloak, confirming the permanent validity of the Gospel saying: “I was naked and you clothed me ... as you did it to one of the least of these my brethren, you did it to me” ( Mt 25:36, 40). Yet in the history of the Church, how many other testimonies to charity could be quoted! In particular, the entire monastic movement, from its origins with Saint Anthony the Abbot († 356), expresses an immense service of charity towards neighbour. In his encounter “face to face” with the God who is Love, the monk senses the impelling need to transform his whole life into service of neighbour, in addition to service of God. This explains the great emphasis on hospitality, refuge and care of the infirm in the vicinity of the monasteries. It also explains the immense initiatives of human welfare and Christian formation, aimed above all at the very poor, who became the object of care firstly for the monastic and mendicant orders, and later for the various male and female religious institutes all through the history of the Church. The figures of saints such as Francis of Assisi, Ignatius of Loyola, John of God, Camillus of Lellis, Vincent de Paul, Louise de Marillac, Giuseppe B. Cottolengo, John Bosco, Luigi Orione, Teresa of Calcutta to name but a few—stand out as lasting models of social charity for all people of good will. The saints are the true bearers of light within history, for they are men and women of faith, hope and love.
Source: Deus Caritas Est (Vatican.va)