Ephesians 5:16
"Redeeming the time, because the days are evil."

Matthew 7:15
"Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves."

Matthew 10:16
"Behold, I send you forth as sheep in the midst of wolves: be ye therefore wise as serpents, and harmless as doves."

2 Corinthians 11:14
"And no marvel; for Satan himself is transformed into an angel of light."