"Satan would seem to be mannerly and reasonable; making as if he would be content with one-half of the heart, whereas God challengeth all or none: ...But this is nothing but a crafty fetch of Satan; for he knows that if he have any part, God will have none: so the whole falleth to his share alone."
By Joseph Hall (1633-1710)
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