Genesis 48:14

14.And Israel stretched out his right hand. Seeing his eyes were dim with age, so that he could not, by looking, discern which was the elder, he yet intentionally placed his hands across. And therefore Moses says that he guided his hands wittingly, because he did not rashly put them forth, nor transfer them from one youth to the other for the sake of feeling them: but using judgment, he purposely directed his right hand to Ephraim who was the younger: but placed his left hand on the first-born. Whence we gather that the Holy Spirit was the director of this act, who irradiated the mind of the holy man, and caused him to see more correctly, than those who were the most clear-sighted, into the nature of this symbolical act. I shall avoid saying more, because we shall be able to inquire into it from other passages.