The Franciscan Friars commit their lives to "The Rule and Life of the Friars Minor" written by St. Francis of Assisi.  
In the Rule, St. Francis wrote about the importance of 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. Noe Alfaro professing his vows to the Rule and Life of the Friars Minor