Bring It On, Satan!

Read the meme above.

Many religious people think they are so important that God is watching them 24 hours a day to see if they tell a white lie or eat too many cookies. But it gets better. Not only is the creator of reality monitoring you all day, every day, but Satan, the personification of evil, is constantly tempting you to lie, overeat, swear, etc.

Vocabulary Question: What does the word personification mean in the paragraph above?

Content Question: Was Satan always seen as evil in the bible, or did this change over time?