The Dialogue

Catherine of Siena (25 March 1347 – 29 April 1380), a lay member of the Dominican Order, was a mystic, activist, and author who had a great influence on Italian literature and the Catholic Church. Canonized in 1461, she is also a Doctor of the Church.

She was born and raised in Siena, and at an early age wanted to devote herself to God, against the will of her parents. She joined the Dominican tertiaries. She made herself known very quickly by being marked by mystical phenomena such as invisible stigmata and a mystical marriage. Her influence with Pope Gregory XI played a role in his decision to leave Avignon for Rome. She was then sent by him to negotiate peace with Florence. After Gregory XI's death and peace concluded, she returned to Siena. She dictated to secretaries her set of spiritual treatises The Dialogue of Divine Providence. The Great Schism of the West led Catherine of Siena to go to Rome with the pope. She sent numerous letters to princes and cardinals to promote obedience to Pope Urban VI and defend what she calls the "vessel of the Church." She died on 29 April 1380, exhausted by her penances. Urban VI celebrated her funeral and burial in the Basilica of Santa Maria sopra Minerva in Rome.

The devotion around Catherine of Siena developed rapidly after her death. She was canonized in 1461, declared patron saint of Rome in 1866, and of Italy (together with Francis of Assisi) in 1939. She was the first woman (along with Teresa of Ávila) to be declared a "doctor of the Church," on 4 October 1970 by Pope Paul VI. She was also proclaimed patron saint of Europe in 1999 by Pope John Paul II. 
Source: https://en.wikipedia.org/wiki/Catherine_of_Siena

“Even if [the Pope an incarnate devil], we ought not to raise up our heads against him, but calmly lie down to rest on his bosom... He who rebels against our Father is condemned to death, for that which we do to him we do to Christ: we honor Christ if we honor the Pope; we dishonor Christ if we dishonor the Pope.  I know very well that many defend themselves by boasting: 'They are so corrupt, and work all manner of evil!' But God has commanded that, even if the priests, the pastors, and Christ-on-earth were incarnate devils, we be obedient and subject to them, not for their sakes, but for the sake of God, and out of obedience to Him.” 

“Start being brave about everything. Drive out darkness and spread light. Don’t look at your weaknesses. Realize instead that in Christ crucified you can do everything.” 

“And of what should we be afraid? Our captain on this battlefield is Christ Jesus. We have discovered what we have to do. Christ has bound our enemies for us and weakened them that they cannot overcome us unless we so choose to let them. So we must fight courageously and mark ourselves with the sign of the most Holy Cross.”