"Teachers and students are to come close together in Christian fellowship. The youth will make many mistakes, and the teacher is never to forget to be compassionate and courteous. Never is he to seek to show his superiority. The greatest of teachers are those who are most patient, most kind. By their simplicity and their willingness to learn they encourage their students to climb higher and still higher. CT 269.2"
"Charity suffereth long, and is kind; charity envieth not; charity vaunteth not itself, is not puffed up,"
The EGW passage describes qualities of a good teacher (patience, kindness, humility) that strongly parallel the characteristics of love described in 1 Corinthians 13:4. While not a direct quote, the thematic overlap is significant.
"them to Jesus. Eternity alone will reveal the results of such effort. CT 269.3"
"And whosoever shall give to drink unto one of these little ones a cup of cold water only in the name of a disciple, verily I say unto you, he shall in no wise lose his reward."
Both passages emphasize the idea that seemingly small acts of kindness or effort, done in the name of Jesus, will have eternal rewards. The EGW passage speaks of leading people to Jesus, while Matthew 10:42 speaks of giving a cup of water. The underlying principle of reward for service is present in both.