Ephesians 5:15-21

Look carefully then how you walk, not as unwise but as wise, making the best use of the time, because the days are evil. Therefore do not be foolish, but understand what the will of the Lord is. And do not get drunk with wine, for that is debauchery, but be filled with the Spirit, addressing one another in psalms and hymns and spiritual songs, singing and making melody to the Lord with your heart, giving thanks always and for everything to God the Father in the name of our Lord Jesus Christ, submitting to one another out of reverence for Christ.

Ephesians 5:15-21

I guess there's quite a few things here.  The earlier instruction is for his readers to walk in love.  Paul has also just finished telling them about the idea that things are exposed by the light and that we are children of light.  In "light" of this, we are to be careful about how we live.  We are instructed to be wise, to make the best use of our time, to understand the lord's will, to not be drunk but instead filled with the Holy Spirit, singing to the Lord, giving thinks always, and submitting to one another.  These are all good and important things that also tie in to walking as children of light.  As one walks in these things, it probably gets more and more difficult to walk in darkness.  Living with thankfulness to God or with a worshipful heart toward God is probably hard to do while living in darkness.  As Paul is encouraging his readers, let us carefully watch the way that we live.