"Fellow laborers, we are each sowing seed in the fields of life. As is the seed, so will be the harvest. If we sow distrust, envy, jealousy, self-love, bitterness of thought and feeling, we shall reap bitterness to our own souls. If we manifest kindness, love, tender thought for the feelings of others, we shall receive the same in return. CT 93.1"
"Be not deceived; God is not mocked: for whatsoever a man soweth, that shall he also reap."
The EGW passage directly echoes and expands upon the principle of sowing and reaping found in Galatians 6:7.
"to wound needlessly the self-respect of others. This rule should be sacredly observed toward the dullest, the youngest, the most blundering students. What God intends to do with these apparently uninteresting youth, you do not know. He has, in the past, accepted persons no more promising or attractive, to do a great work for Him. His Spirit, moving upon the heart, has aroused every faculty to vigorous action. The Lord saw in those rough, unhewn stones, precious material, that would stand the test of storm and heat and pressure. God sees not as man sees. He judges not from appearance, but he searches the heart and judges righteously. CT 93.2"
"But the Lord said unto Samuel, Look not on his countenance, or on the height of his stature; because I have refused him: for the Lord seeth not as man seeth; for man looketh on the outward appearance, but the Lord looketh on the heart."
The EGW passage explicitly references the idea that God sees not as man sees, directly alluding to 1 Samuel 16:7 and expanding on its meaning in the context of education.