"To every one of His appointed agencies the Lord sends the message: “Take your position at your post of duty, and then stand firm for the right.” To all I am instructed to say: “Find your place. Receive not the fanciful sentiments of men who are not taught by God. Christ is waiting to give you insight into heavenly things, waiting to quicken your spiritual pulse to renewed activity. No longer subordinate the claims of future, eternal interests to the common affairs of this life. ‘Ye cannot serve God and mammon.’ Matthew 6:24 . Wake up, brethren, wake up.” 8T 203.3"
"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."
Ellen White directly references Matthew 6:24 in this passage.