'Visions' in the Bible

"And it shall come to pass in the last days, God says, that I will pour out My Spirit upon all mankind; and your sons and your daughters shall prophesy, and your young men shall see visions, and your old men shall have dreams;

I am compelled to boast. It is not a profitable employment, but I will proceed to visions and revelations granted me by the Lord.

Let no one defraud you of your prize, priding himself on his humility and on his worship of the angels, and taking his stand on the visions he has seen, and idly puffed up with his unspiritual thoughts.