St. Augustine of Hippo is the patron of brewers because of his conversion from a former life of loose living, which included parties, entertainment, and worldly ambitions. His complete turnaround and conversion has been an inspiration to many who struggle with a particular vice or habit they long to break.
St. Augustine's Prayer to the Holy Spirit
Breathe in me, O Holy Spirit, that my thoughts may all be holy. Act in me, O Holy Spirit, that my work, too, may be holy. Draw my heart, O Holy Spirit, that I love but what is holy. Strengthen me, O Holy Spirit, to defend all that is holy. Guard me, then, O Holy Spirit, that I always may be holy. Amen.