1. I don’t know what people in the world think of me, but I think like this: I seem to be playing on the sea, sometimes I find a smooth stone, sometimes I find a beautiful shell and do it. Happy child, nevertheless, the ocean of truth mysteriously unfolds before us.

2. There is no smooth road in science. Only those who are not afraid of hard work and climb the steep mountain road can hope to reach the glorious peak.

3. Not knowing is not scary or harmful. No one can know everything. What is scary and harmful is not knowing but pretending to know.

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