What is the meaning of “had sent him a rage of vision” in this excerpt:
The old man was in a position to know what his ideas were. He had lived for three months in the nephew's house on what he had thought at the time was Charity but what he said he had found out was not Charity or anything like it. All the time he had lived there, the nephew had secretly been making a study of him. The nephew, who had taken him in under the name of Charity, had at the same time been creeping into his soul by the back door, asking him questions that meant more than one thing, planting traps around the house and watching him fall into them, and finally coming up with a written study of him for a schoolteacher magazine. The stench of his behaviour had reached heaven and the Lord Himself had rescued the old man. He had sent him a rage of vision, had told him to fly with the orphan boy to the farthest part of the backwoods and raise him up to justify his Redemption. The Lord had assured him a long life and he had snatched the baby from under the schoolteacher's nose and taken him to live in[…]”
From the book The Violent Bear It Away, by Flannery O’Connor (ch.1, p.4).