15 THEREFORE BE CAREFUL HOW YOU WALK, NOT AS UNWISE MEN BUT AS WISE, 16 MAKING THE MOST OF YOUR TIME, BECAUSE THE DAYS ARE EVIL. 17 SO THEN DO NOT BE FOOLISH, BUT UNDERSTAND WHAT THE WILL OF THE LORD IS.
Before these few verses Paul tells us to be imitators of God, and to walk in Love just as Jesus Christ did through His fragrant offering to the Lord upon the Cross. Paul also says to put off the old self, all impurity, immorality, and coarse jesting (joking talk); in fact, these types of things should not even be mentioned among us. Furthermore, Paul says we should expose the evil by shinning the light of Christ.
Then we get to verses 15-17. As a result of what Paul said, you must be careful how you walk. What does it mean to walk as unwise men? Unwise men do not walk in the light, they seek to live in the dark, engaging in various impurities or immoralities. This can be gossip, slander, demeaning attitudes toward another and far worse.
Wise men seek out the light and willfully walk in it so that they can expose the evil deeds of others to the light of Jesus Christ. Wise men do not engage in gossip, slander, coarse joking, immorality, impurity, or complaining. But notice what Paul then says in verse 16-17. We are to make the most of our time because the days are evil, and we are not to be foolish but understand what the will of God is.
How can we make the most of our time, not be foolish and understand the will of God? 1) We have to treat everyday as the only day. We have to seek out ways to share Christ with a lost and dying world. 2) We have understand that scripture says "the fool has said there is no God" and so we need to embrace God in every way possible. We need to pray, we need to study His word because this is the only way we an understand what the will of God is.
Dear Christian seek to walk in the light of Christ, make the most of your time by sharing Jesus everywhere you go, and understand God's will by praying to Him and studying His word.