"place?” This should be the measurement of our duty. Do not place yourselves needlessly in the society of those who by their arts would weaken your purpose to do right, or bring a stain upon your conscience. Do nothing among strangers, in the street, on the cars, in the home, that would have the least appearance of evil. Do something every day to improve, beautify, and ennoble the life that Christ has purchased with His own blood. MH 491.1"
"What? know ye not that your body is the temple of the Holy Ghost which is in you, which ye have of God, and ye are not your own? For ye are bought with a price: therefore glorify God in your body, and in your spirit, which are God’s."
Both passages connect the idea of being bought with a price (Christ's blood) with the responsibility to live a life that honors God.
"Always act from principle, never from impulse. Temper the natural impetuosity of your nature with meekness and gentleness. Indulge in no lightness or trifling. Let no low witticism escape your lips. Even the thoughts are not to be allowed to run riot. They must be restrained, brought into captivity to the obedience of Christ. Let them be placed upon holy things. Then, through the grace of Christ, they will be pure and true. MH 491.2 We need a constant sense of the ennobling power of pure thoughts. The only security for any soul is right thinking. As a man “thinketh in his heart, so is he.” Proverbs 23:7 . The power of self-restraint strengthens by exercise. That which at first seems difficult, by constant repetition grows easy, until right thoughts and actions become habitual. If we will we may turn away from all that is cheap and inferior, and rise to a high standard; we may be respected by men and beloved of God. MH 491.3"
"For as he thinketh in his heart, so is he: Eat and drink, saith he to thee; but his heart is not with thee."
Ellen White directly references Proverbs 23:7 in this passage.