Prophecy: What is it, and can it happen now?

(9) When you enter the land that your God יהוה is giving you, you shall not learn to imitate the abhorrent practices of those nations. (10) Let no one be found among you who consigns a son or daughter to the fire, or who is an augur, a soothsayer, a diviner, a sorcerer, (11) one who casts spells, or one who consults ghosts or familiar spirits, or one who inquires of the dead. (12) For anyone who does such things is abhorrent to יהוה, and it is because of these abhorrent things that your God יהוה is dispossessing them before you. (13) You must be wholehearted with your God יהוה. (14) Those nations that you are about to dispossess do indeed resort to soothsayers and augurs; to you, however, your God יהוה has not assigned the like. (15) From among your own people, your God יהוה will raise up for you a prophet like myself; that is whom you shall heed. (16) This is just what you asked of your God יהוה at Horeb, on the day of the Assembly, saying, “Let me not hear the voice of my God יהוה any longer or see this wondrous fire any more, lest I die.” (17) Whereupon יהוה said to me, “They have done well in speaking thus. (18) I will raise up for them from among their own people a prophet like yourself, in whose mouth I will put My words and who will speak to them all that I command; (19) and anybody who fails to heed the words [the prophet] speaks in My name, I Myself will call to account. (20) But any prophet who presumes to speak in My name an oracle that I did not command to be uttered, or who speaks in the name of other gods—that prophet shall die.” (21) And should you ask yourselves, “How can we know that the oracle was not spoken by יהוה?”— (22) if the prophet speaks in the name of יהוה and the oracle does not come true, that oracle was not spoken by יהוה; the prophet has uttered it presumptuously: do not stand in dread of that person.

...[After these preparations,] the divine spirit will immediately rest upon him.
When the spirit rests upon him, his soul becomes intermingled with the angels called ishim, and he will be transformed into a different person and will understand with a knowledge different from what it was previously. He will rise above the level of other wise men, as [the prophet, Samuel] told Saul [I Samuel 10:6]: "[The spirit of God will descend upon you] and you shall prophesy with them. And you will be transformed into a different person."

(2) There are a number of levels among the prophets. Just as with regard to wisdom, one sage is greater than his colleague, so, too, with regard to prophecy, one prophet is greater than another. They all, [however, share certain commonalities]. They receive prophetic visions only in a visionary dream or during the day after slumber has overtaken them, as [Numbers 12:6] states: "I make Myself known to him in a vision. I speak to him in a dream."
When any of them prophesy, their limbs tremble, their physical powers become weak, they lose control of their senses, and thus, their minds are free to comprehend what they see, as [Genesis 15:12] states concerning Abraham: "and a great, dark dread fell over him." Similarly, Daniel [10:8] states: "My appearance was horribly changed and I retained no strength."

(3) When a prophet is informed of a message in a vision, it is granted to him in metaphoric imagery. Immediately, the interpretation of the imagery is imprinted upon his heart, and he knows its meaning.
For example, the ladder with the angels ascending and descending envisioned by the patriarch, Jacob, was an allegory for the empires and their subjugation [of his descendants]. Similarly, the creatures Ezekiel saw, the boiling pot and the rod from an almond tree envisioned by Jeremiah, the scroll Ezekiel saw, and the measure seen by Zechariah [were all metaphoric images]. This is also true with regard to the other prophets.
Some would relate the allegory and its explanation as these did. Others would relate only the explanation. At times, they would relate only the imagery without explaining it, as can be seen in some of the prophecies of Ezekiel and Zechariah.
All of the prophecies come in the form of metaphoric imagery and allegories.

(1) It is [one] of the foundations of [our] faith that God conveys prophecy to man.
Prophecy is bestowed only upon a very wise sage of a strong character, who is never overcome by his natural inclinations in any regard. Instead, with his mind, he overcomes his natural inclinations at all times. He must [also] possess a very broad and accurate mental capacity.

A person who is full of all these qualities and is physically sound [is fit for prophecy]. When he enters the Pardes and is drawn into these great and sublime concepts, if he possesses an accurate mental capacity to comprehend and grasp [them], he will become holy. He will advance and separate himself from the masses who proceed in the darkness of the time. He must continue and diligently train himself not to have any thoughts whatsoever about fruitless things or the vanities and intrigues of the times.
Instead, his mind should constantly be directed upward, bound beneath [God's] throne [of Glory, striving] to comprehend the holy and pure forms and gazing at the wisdom of the Holy One, blessed be He, in its entirety, [in its manifold manifestations] from the most elevated [spiritual] form until the navel of the earth, appreciating His greatness from them. [After these preparations,] the divine spirit will immediately rest upon him.
When the spirit rests upon him, his soul becomes intermingled with the angels called ishim, and he will be transformed into a different person and will understand with a knowledge different from what it was previously. He will rise above the level of other wise men, as [the prophet, Samuel] told Saul [I Samuel 10:6]: "[The spirit of God will descend upon you] and you shall prophesy with them. And you will be transformed into a different person."

§ Since Shmuel HaKatan and his great piety were mentioned, the Gemara now relates several incidents that shed additional light on his personality. The Sages taught: After the last of the prophets, Haggai, Zechariah, and Malachi, died, the Divine Spirit of prophetic revelation departed from the Jewish people. But nevertheless, they were still utilizing a Divine Voice, which they heard as a kind of echo of prophecy. One time, a group of Sages were reclining in the loft of the house of Gurya in Jericho, and a Divine Voice was bestowed upon them from Heaven, saying: There is one here who is fit for the Divine Presence to rest upon him as it rested upon Moses our teacher, but his generation is not deserving of this distinction. The Sages set their eyes upon Hillel the Elder, trusting that he was the one indicated by the Divine Voice. And when he died, the Sages said about him: Alas, the pious man, alas, the humble man, a disciple of Ezra.

The mishna taught that from the time when Rabban Yoḥanan ben Zakkai died, wisdom ceased. The Sages taught: From the time when Rabbi Eliezer died, it was as if the Torah scroll had been interred, as he had memorized many secrets of the Torah. From the time when Rabbi Yehoshua died, council and deliberate thought ceased, as he had the sharpest mind in Israel. From the time when Rabbi Akiva died, the powerful arm of Torah, meaning the exposition of all the details of Torah scripture, ceased, and the fountains of wisdom were sealed. From the time when Rabbi Elazar ben Azarya died, the crowns of wisdom ceased, as “the crown of the wise is their riches” (Proverbs 14:24), and he was both a great Torah scholar and a very wealthy man. From the time when Rabbi Ḥanina ben Dosa died, the men of wondrous deeds ceased. From the time when Abba Yosei ben Katonta died, the pious men ceased. And why was he called Abba Yosei ben Katonta? Because he was among the diminished [miktanei] of the pious people, i.e., he lived in an era when the pious had become few. From the time when ben Azzai died, the diligent ceased; from the time when ben Zoma died, the exegetists ceased. From the time when Rabban Shimon ben Gamliel died, locusts ascended upon the land and troubles proliferated. From the time when Rabbi Yehuda HaNasi died, the troubles multiplied.