St. Faustina
“The floodgates of heaven are open to a humble soul, and a sea of graces flows down upon her. O how beautiful is a humble soul? …God refuses nothing to such a soul; she is all-powerful and influences the destiny of the whole world. God raises such a soul up to His very throne, and the more she humbles herself, the more God stoops down to her, pursuing her with His graces and accompanying her at every moment with His omnipotence. Such a soul is most deeply united with God. O humility, strike deep roots in my whole being. O Virgin most pure, but also most humble, help me to attain deep humility. Now I understand why there are so few saints; it is because so few souls are deeply humble.”
Source: St. Faustina, Diary: Divine Mercy in My Soul