"Your faithfulness in labor is praiseworthy. Others in the office would do well to imitate your example of fidelity, diligence, and thoroughness. But you lack the graces of the Spirit of God. You are an intelligent man, but your powers have been abused. Jesus presents to you His grace, patience, and love. Will you accept the gift? Be careful of your words and actions. You are sowing seed in your daily life. Every thought, every word uttered, and every action performed, is seed cast into the soil, which will spring up and bear fruit to life eternal or to misery and corruption. Think, my brother, how the angels of God look upon your sad state when you let passion control you. And then it is written in the books of heaven. As is the seed sown, so will be the harvest. You must reap that which you have sown. 4T 366.1"
"Be not deceived; God is not mocked: for whatsoever a man soweth, that shall he also reap."
The EGW passage directly quotes and applies the principle of sowing and reaping from Galatians 6:7.
You should control the appetite and in the name of Jesus be a conqueror on this point. Your health may improve with correct habits. Your nervous system is greatly shattered; but the Great Physician can heal your body as well as your soul. Make His power your dependence, His grace your strength, and your physical, moral, and spiritual powers will be greatly improved. You have more to overcome than some others, and therefore will have more severe conflicts; but Jesus will regard your earnest efforts; He knows just how hard you have to work to keep self under the control of His Spirit. Place yourself in the hands of Jesus. Self-culture should be your business, with the object before you of being a blessing to your children and to all with whom you associate. Heaven will look with pleasure upon every victory you gain in the work of overcoming. If you put away anger and passion, and look unto Jesus, who is the Author and Finisher of your faith, you may, through His merits, develop a Christi…
"But I keep under my body, and bring it into subjection: lest that by any means, when I have preached to others, I myself should be a castaway."
Both passages discuss the importance of self-control and subduing the body/appetite. While not a direct quote, the theme aligns.
"When I was shown the present condition of man in physical, mental, and moral power, and what he might become through the merits of Christ, I was astonished that he should preserve such a low level. Man may grow up into Christ, his living head. It is not the work of a moment, but that of a lifetime. By growing daily in the divine life, he will not attain to the full stature of a perfect man in Christ until his probation ceases. The growing is a continuous work. Men with fiery passions have a constant conflict with self; but the harder the battle, the more glorious will be the victory and the eternal reward. 4T 366.3"
"Till we all come in the unity of the faith, and of the knowledge of the Son of God, unto a perfect man, unto the measure of the stature of the fulness of Christ:"
Both passages discuss growing into the fullness of Christ, although EGW elaborates on the process as a lifelong endeavor.