To Know God's Will

It must be possible to know Gods will. I think in the past I have sometimes thought that it was not possible, but if the Bible asks us to understand it, then it must be possible. I'm trying to get back into bible reading to get a better understanding and get closer to God.

Eph 5:15-17
Be very careful, then, how you live—not as unwise but as wise, making the most of every opportunity, because the days are evil. Therefore do not be foolish, but understand what the Lord's will is.