"Then I saw an angel coming down from heaven, having the key to the bottomless pit and a great chain in his hand. He laid hold of the dragon, that serpent of old, who is the Devil and Satan, and bound him for a thousand years..." (Rev. 20:1-2)

The above verses speak of Satan being bound; however, 1 Pet. 5:8 speaks of Satan walking about as a roaring lion seeking whom he may devour. Satan is bound in much the same way as a dog chained to a wire between two trees. The dog can manipulate only within the limited distance between the trees and to the length of the chain from side to side. Likewise, Satan is bound and cannot tempt men above that which they are able to bear (1 Cor. 10:13).