Hearken unto me, you that know righteousness, the people in whose heart is my law; fear not the reproach of men, neither be afraid of their revilings Isaiah 51:7
"It is very easy for a person to convince himself that he has a good 
excuse for disobeying God’s law, but we have no reason to suppose that God will accept man’s opinion as the standard of the Judgment.
The very fact that people offer excuses for not keeping the Sabbath is proof that in their hearts they believe that the Sabbath law is still binding. If it were not, there would be no need of an excuse."
E.J. Waggoner