Jesus said, "It is written, 'Man does not live on bread alone, but on every word that comes from thee mouth of God': (Maathew 4:4). Paul told Timothy, "All scripture is God breathed and is useful for eaching, rebuking, correcting and training in righteousness, so that the man of God may be throughly equipped for every good work (2 Timothy 3:16-17).
In other words, we do not get to pick and choose which words of God we want to follow and which ones we will ignore. Peter sums up the instructions of God in one simiple sentence, "But as He who called you is holy, you also be holy in all your conduct."
God said it even more simply, "Be holy, for I am holy."
