The brain is an integral part of the body. The mind is a function of the brain. Thoughts, feelings, character, willpower, personality, temperament, etc are functions of the brain. She says - "The lower passions have their seat in the body and work through it."

There are many who would receive the truths of God's word, their judgment having been convinced by the clearest evidence; but the carnal desires, clamoring for gratification, control the intellect, and they reject truth because it conflicts with their lustful desires. The minds of many take so low a level that God cannot work either for them or with them. The current of their thoughts must be changed, their moral sensibilities must be aroused, before they can feel the claims of God. {CTBH 9.2}

Pride and fashion hold men and women in the veriest slavery to customs which are fatal to health and even to life itself. The appetites and passions, clamoring for indulgence, trample reason and conscience underfoot. This is the cruel work of Satan, and he is constantly putting forth the most determined efforts to strengthen the chains by which he has bound his victims. Those who have been all their lives indulging wrong habits do not always realize the necessity of a change. And many will persist in gratifying their desire for sinful pleasure at any cost. Let the conscience be aroused and much is gained. Nothing but the grace of God can convict and convert the heart; here alone can the slaves of custom obtain power to break the shackles which bind them. The self-indulgent must be led to see and feel that a great moral renovation is necessary if they would meet the claims of the divine law; the soul-temple has been defiled, and God calls upon them to arouse and strive with all their might to win back the God-given manhood which has been sacrificed through sinful indulgence. {4T 552.2}

When burdened, when pressed with temptation, when the feelings and desires of the natural heart are clamoring for the victory, earnest, fervent, importunate prayer in the name of Christ brings Jesus to your side as a helper, and through His name you gain the victory and Satan is vanquished. {OHC 25.2}

Divine truth can make little impression upon the intellect while the customs and habits are opposed to its principles. Those who are willing to inform themselves concerning the effect of sinful indulgence upon the health, and who commence the work of reform, even if it be from selfish motives, in so doing place themselves where the truth of God may find access to their hearts. And, on the other hand, those who are reached by the presentation of Scripture truth are then in a position where their consciences will be aroused upon the subject of health. They see and feel the necessity of breaking away from the tyrannizing habits and appetites which have ruled them so long. There are many who would receive the truths of God's word, their judgment having been convinced by the clearest evidence; but the carnal desires, clamoring for gratification, control the intellect, and they reject truth as falsehood, because it comes in collision with their lustful affections. {4T 553.1}

Satan will lead them on from step to step, as it were blindfolded, and with his suggestions will, as they advance, stir up the human passions to depravity which will prove their eternal ruin. There is already developing a strong inclination to that which is evil and destructive in its manifestation. Appetites and passions are clamoring for indulgence and gratification. Reason and conscience remonstrated at every step for a time, but the voice of Satan is heard presenting worldly lusts in attractive garments, and sin becomes attractive. They depart farther from the counsel of God and the authoritative voice speaking from His Word. These youth need to pray, "Lead us not into temptation, but deliver us from evil." {20MR 52.4}