Didacus is living proof that God "chose what is foolish in the world to shame the wise; God chose what is weak in the world to shame the strong" (1 Corinthians 1:27).
As a young man in Spain, Didacus joined the Secular Franciscan Order and lived for some time as a hermit. After Didacus became a Franciscan brother, he developed a reputation for great insight into God’s ways. His penances were heroic. He was so generous with the poor that the friars sometimes grew uneasy about his charity.
Didacus volunteered for the missions in the Canary Islands and labored there energetically and profitably. He was also the superior of a friary there.
In 1450 he was sent to Rome to attend the canonization of St. Bernardine of Siena. When many friars gathered for that celebration fell sick, Didacus stayed in Rome for three months to nurse them. After he returned to Spain, he pursued a life of contemplation full-time. He showed the friars the wisdom of God’s ways.
As he was dying, Didacus looked at a crucifix and said: "O faithful wood, O precious nails! You have borne an exceedingly sweet burden, for you have been judged worthy to bear the Lord and King of heaven" (Marion A. Habig, O.F.M., The Franciscan Book of Saints, p. 834).
San Diego, California, is named for this Franciscan, who was canonized in 1588.