As Per the deuterocanonical book The Testament of Solomon :
“I therefore, having heard this, glorified the Lord God, and again I questioned the demon, saying: “Tell me how ye can ascend into heaven, being demons, and amidst the stars and holy angels intermingle.” And he answered: “Just as things are fulfilled in heaven, so also on earth (are fulfilled) the types1 of all of them. For there are principalities, authorities, world-rulers2, and we demons fly about in the air; and we hear the voices of the heavenly beings, and survey all the powers. And as having no ground (basis) on which to alight and rest, we lose strength and fall off like leaves from trees. And men seeing us imagine that the stars are falling from heaven. But it is not really so, O king; but we fall because of our weakness, and because we have nowhere anything to lay hold of; and so we fall down like lightnings3 in the depth of night and suddenly. And we set cities in flames and fire the fields. For the stars have firm foundations in the heavens like the sun and the moon.” 1
This is why psychics, mediums, and channelers are never even close to 100 % correct, as the demons they rely eavesdrop on heavenly deliberations to get information and fall down from exhaustion before they can overhear the full decisions and discussions.
1 The Testament Of Solomon 20:14-17, available at http://www.esotericarchives.com/solomon/testamen.htm (disregard the rest of the Occultic stuff at this website. Unfortunately this site is the only place online where I could find a copy of the text.)