God retains rights to withhold blessing and healing from those rejecting him, yet he graciously allows many to receive them anyway.
Luke 4:25-27
25 But in truth, I tell you, there were many widows in Israel in the days of Elijah, when the heavens were shut up three years and six months, and a great famine came over all the land, 26 and Elijah was sent to none of them but only to Zarephath, in the land of Sidon, to a woman who was a widow. 27 And there were many lepers in Israel in the time of the prophet Elisha, and none of them was cleansed, but only Naaman the Syrian.”