'Sober' in the Bible

Wherefore girding up the loins of your mind, be sober and set your hope perfectly on the grace that is to be brought unto you at the revelation of Jesus Christ;

But the end of all things is at hand: be ye therefore of sound mind, and be sober unto prayer:

Be sober, be watchful: your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour,