Ephesians 5:15
Walk circumspectively as wise and not as fools, discerning the times, for the days are evil.

This passage is in the New Testament portion of the bible, where we are located as Christians.
Generally it means to look around using knowledge and understanding with wisdom to decide how to act in all situations.

As God is real to us, so is the devil (i.e., Satan). There is always going to be evil in this world until Jesus completely takes over. While we are here on earth we must be wise to the tricks of the enemy, at times so subtle that we fall in to wrong decisions.

Glorify God, enjoy His goodness in you life, all the while walking in wisdom. Keep on praying as you walk the walk that you talk.