No man can serve two masters...You cannot serve God and Mammon. Matthew 6:24
"....we say that we would get them to respect the Sabbath, by inducing them to respect its Author.
--Let their hearts be changed, so that they will reverence God and 
His word, and the work is already done.
--If people really have reverence for God’s word (not merely such portions as suit their fancy, but the whole of it), they will reverence the fourth commandment; and if they respect the fourth commandment, they must necessarily keep the seventh day,—Saturday,—as is therein enjoined." E.J. Waggoner