"You are of your father the devil, and the lusts of your father you will do. He was a murderer from the beginning, and stayed not in the truth, because there is no truth in him. When he speaks a lie, he speaks of his own: for he is a liar, and the father of it." (John 8:44 AKJV)
 
When we reject the truth, there is but one other alternative, the lie. The Devil is the father of all lies.