Therefore, now here, now there, were they able to be, who from hence bore thither whom God willed. It may be also, that the spirits of the dead do learn some things which are doing here, what things it is necessary that they should know, and what persons it is necessary should know the same, not only things past or present, but even future, by the Spirit of God revealing them: like as not all men, but the Prophets while they lived here did know, nor even they all things, but only what things to be revealed to them the providence of God judged meet. Moreover, that some from the dead are sent to the living, as, on the other hand, Paul from the living was rapt into Paradise, divine Scripture doth testify.  For Samuel the Prophet, appearing to Saul when living, predicted even what should befall the king:  although some think it was not Samuel himself, that could have been by magical arts evoked, but that some spirit, meet for so evil works, did figure his semblance:  though the book Ecclesiasticus, which Jesus, son of Sirach, is reputed to have written, and which on account of some resemblance of style is pronounced to be Solomon's,  contains in the praise of the Fathers, that Samuel even when dead did prophesy. But if this book be spoken against from the canon of the Hebrews,  (because it is not contained therein,) what shall we say of Moses, whom certainly we read both in Deuteronomy to have died,  and in the Gospel to have, together with Elias who died not, appeared unto the living? 
 1 Sam. xxviii.11-19
 Quæst. ad Simplicianum, lib. ii. qu.4.
 Retract. ii.4, and "On Christian Doctrine," book ii. chap. viii., vol. ii. p.539. Ben. ed.
 Ecclus. xlvi.20
 Deut. xxxiv.5
 Matt. xvii.3