"Humanitarian work alone, however, is not sufficient for canonization in the Catholic Church. Normally, a candidate must be associated with at least two miracles. The idea is that a person worthy of sainthood must demonstrably be in heaven, actually interceding with God on behalf of those in need of healing."
http://www.npr.org/sections/thetwo-way/2017/05/13/528264150/pope-francis-announces-two-new-saints-on-100-year-anniversary-of-their-vision
