There are many levels among the prophets. Just as there can be one person who is greater than another in wisdom, likewise one person can be greater than another in prophecy. All but the greatest of prophets only receive their prophecy in a vision in a dream at night, or during the day when a great trance falls upon them, as it says, “In a vision I will become known to him, in a dream I will speak to him.” When they receive their prophecy, their limbs shake, their body becomes weak, they lose their senses, and their mind becomes clear to understand what it sees. This is what it states concerning Abraham: “and a great, dark dread fell over him.” Similarly, the prophet Daniel described his condition when a vision appeared to him: “My appearance was horribly changed, and I retained no strength.”
They do not have prophecy whenever they want. If they desire to receive a prophecy, for themselves or someone else, they need to direct their minds to God and sit in seclusion with feelings of happiness. For prophecy does not come to rest on prophet while he is sad, or lethargic, but rather only when he is happy. Therefore, when the prophet Elisha needed to receive a prophecy, but his mind was agitated, he called for a musician to play for him to settle and uplift his mood. Then he was able to prophesy, as it says, “It happened that as the musician played, the hand of God came upon him.” (Seven Gates of Righteous Knowledge by Rabbi Moshe Weiner and Dr. Michael Schulman, Ask Noah International, 2017, p 51).