If we read the Bible, learn as much as we can, ask questions of the “older” Christians in our life, when the time comes, we will know what is worldly and what is God’s will. He will show us. We have to be close to Him to hear His voice though and we do that by studying the scripture, praying daily and constantly about everything and by surrounding ourselves with Christians. We have to help each other stay accountable to God by pointing out when we go astray.