'Shrewd' in the Bible

“Look, I’m sending you out like sheep among wolves. Therefore be as shrewd as serpents and as harmless as doves.

And his master praised the unrighteous manager because he had acted shrewdly; for the sons of this age are more shrewd in relation to their own kind than the sons of light.

It was he who took shrewd advantage of our race and mistreated our fathers so that they would expose their infants and they would not survive.

We, for Christ's sake, are labeled as "foolish"; you, as Christians, are men of shrewd intelligence. We are mere weaklings: you are strong. You are in high repute: we are outcasts.

Here is scope for ingenuity. Let people of shrewd intelligence calculate the number of the Wild Beast; for it indicates a certain man, and his number is 666.