The Franciscan Friars commit their lives to the Rule and Life of the Friars Minor, written by St. Francis of Assisi.  
In his rule, St. Francis outlined a Gospel way of living, through prayer, work, service of others, and brotherhood. 

"After the Lord gave me some brothers, 
no one showed me what I had to do; 
but the Most High Himself revealed to me that 
I should live according to the pattern of the
Holy Gospel. And I had this written down simply 
and in a few words and the Lord Pope 
confirmed it for me." 
-St. Francis of Assisi 

Bro. Noé Alfaro-Casas professing his vows according to the Rule and Life of the Friars Minor--namely, to follow the Gospel of Our Lord Jesus Christ.