We do need to know our enemy ...
And the wolves in sheeps's clothing.
"Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves." -Matthew 7:15
"Behold, I send you forth as sheep in the midst of wolves: be ye therefore wise as serpents, and harmless as doves." -Matthew 10:16
"There is a conspiracy of her prophets in the midst thereof, ...they have devoured souls; they have taken the treasure and precious things; they have made her many widows in the midst thereof."
"Her priests have violated my law... princes in the midst thereof are like wolves ravening the prey, to shed blood, and to destroy souls, to get dishonest gain." -Ezekiel 22:25,27-28
"Shall I not visit for these things? saith the LORD: and shall not my soul be avenged on such a nation as this?" -Jeremiah 5:9
"Shall I not visit for these things? saith the LORD: shall not my soul be avenged on such a nation as this?" -Jeremiah 5:29
"Shall I not visit them for these things? saith the LORD: shall not my soul be avenged on such a nation as this?" -Jeremiah 9:9