There comes a point when we have to acknowledge that it is not solely up to us. God’s grace must be called upon to change a person’s heart. We see in Ezekiel 36:26, “Moreover, I will give you a new heart and put a new spirit within you; and I will remove the heart of stone from your flesh and give you a heart of flesh.” This does not mean that we stop defending the truth, it simply means that we put prayer first and then the rest will follow as God sees fit. We shake the dust from our feet and commend the heart of the hard-hearted person to God.
Mark 6:7-13 New American Bible (Revised Edition) (NABRE)
7 He summoned the Twelve and began to send them out two by two and gave them authority over unclean spirits. 8 He instructed them to take nothing for the journey but a walking stick—no food, no sack, no money in their belts. 9 They were, however, to wear sandals but not a second tunic. 10 He said to them, “Wherever you enter a house, stay there until you leave from there. 11 Whatever place does not welcome you or listen to you, leave there and shake the dust off your feet in testimony against them.” 12 So they went off and preached repentance. 13 They drove out many demons, and they anointed with oil many who were sick and cured them.
Resource: St. Eugene’s News Bulletin