'Alert' in the Bible

So prepare your minds for action, be completely sober [in spirit—steadfast, self-disciplined, spiritually and morally alert], fix your hope completely on the grace [of God] that is coming to you when Jesus Christ is revealed.

The end and culmination of all things is near. Therefore, be sound-minded and self-controlled for the purpose of prayer [staying balanced and focused on the things of God so that your communication will be clear, reasonable, specific and pleasing to Him.]

Be serious! Be alert! Your adversary the Devil is prowling around like a roaring lion, looking for anyone he can devour.