Satan is known as the "Father of all lies," but it is important to understand that he will sometimes tell the truth. But he will speak a truth at the wrong time, in the wrong context, for the purpose of pursuading someone to do something foolish or harmful to themself or another.
A good example of this is when he whispers, "You are your own person. You can make your own choices. You don't have to listen to what anyone else says." All true statements, but usually whispered to someone on the verge of making a foolish choice. And he does not add things like, "others who care about you and have more experience are encouraging you to make choices that will lead to your health and happiness. You can make your own choices, but you cannot choose the consequences of the choices."