Scripture
Romans 14
Audio teachings
Audio Teaching by Aaron Eby
Mind over Mitzvot
Romans 14 leads some people to believe that the Sabbath and kosher laws may be willed away, since "each one should be fully convinced in his own mind."
Audio Teaching by D. T. Lancaster
Weak and Strong
People who keep the Sabbath and eat kosher are weak in faith, but the strong in faith treat every day alike and eat anything.