The most heart-warming sentences to express gratitude to teachers are as follows:

1. There is no end of the world, but only the teacher’s kindness will last forever. Thank you, teacher. Looking around, you are the only one standing in the distance. Although you don’t have the purple aura or the auspicious clouds, you are the only one worthy of such a giant image.

2. Dear teacher, I don’t just think of you today, but I miss you especially today. On this special day, I want to say to you, teacher: Happy Teacher's Day! I wish you health and happiness in the days to come.

3. Teachers are like red candles, lighting themselves to illuminate others. The teacher is like a spring silkworm, spinning out his last silk thread.

4. Teacher kindness is often based on silent care and is often thought-provoking. But only by feeling can we understand its preciousness.

5. I hope that today, all teachers will smile from the bottom of their hearts, for the sake of having peaches and plums all over the world! As long as the teacher is happy.

6. May the cheerful singing surround you all the time. May happy years be with you forever, and I wish you a happy holiday.

7. Teacher, in the light of wisdom emanating from us today, the spark you ignited back then still shines.

8. Spreading knowledge is to sow hope and happiness. Teacher, you are the sower of hope and happiness.

9. Teacher, you are great, like a candle that illuminates others and burns yourself. I wish you a happy holiday and take care of yourself.

10. Teacher, you have inspired me to truly appreciate the blessings of nature. From then on, I understand the green leaves, colorful clouds, and waves.