‘For this reason do not be foolish but understand what the will of the Lord is.'
Because we live in evil days we must be the more careful to ensure that we know what the Christ's will for us is by allowing His light to constantly shine on our lives, by reading His word and meditating and praying in His presence (Matthew 6:6), and listening to His word expounded by reliable men of God. Not to do so, says Paul, is foolish. We learn the will of God as we get to know Him better through His word and through Christian teaching.