We are living in a world that is constantly changing for the better, but also many times for the worse (2 Timothy 3:13). As one continues to live on earth, he will encounter beliefs that differ from what he had been taught. Now it is possible that one could have been taught error, and if such is the case, one needs to forget the old and embrace the new. But such isn't the case always. That is why the Bible warns about getting caught up in changing trends and taken away from the truth (2 Peter 3:17).
Today, America is faced with redefining the family and giving condoms to children in school. God's word has already spoken on both subjects and God's word will stand forever; therefore if one has been taught what God has said on these two subjects, he can be assured that God's word is true and today's modern trends are wrong (Isaiah 55:8–11). God's word teaches that marriage and family is male and female (Matthew 19:4–9). God's word teaches that sex is to be in marriage (Hebrews 13:4). So then, man must stay with God's word or follow the modern trends.
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