No man can serve two masters: for either he will hate the one, and love
the other; or else he will hold to the one, and despise the other. Ye
cannot serve God and mammon. Matthew 6:24
"It is plainly written on the unrenewed heart-----Selfishness is the great law of our degenerate nature.
Selfishness occupies the place in the soul where Christ should sit
enthroned. 
But the Lord requires perfect obedience; and if we truly
desire to serve Him, there will be no question in our minds as to
whether we shall obey His requirements or seek our own temporal
interests.
--Many are falling into the sin of sacrificing their religion for the sake
of worldly gain, preserving a form of piety, yet giving all the mind to
temporal pursuit.
But the law of God must be considered first of all,
and obeyed in spirit and in letter.
Jesus, our great exemplar, in His
life and death, taught the strictest obedience.
*He died, the just for
the unjust, the innocent for the guilty, that the honor of God's law
might be preserved and yet man not utterly perish...." E.G.W.