Once, Socrates poured water across the river, stroked his feet, and fell into the water. He was desperately struggling, yelling for help, and a fisherman not only didn't save him, but turned and left. Finally, his students saved Him. Later the fisherman crossed the river and fell into the water. Socrates and his students happened to take a walk near the river and saved him with a bamboo pole. When the students knew that the fisherman was the one who saved them, they all regretted it, but Socrates said, "No, you should save him. This is the difference between us and him. " This text tells us:. This text mainly introduces:. ['Do nt be small.', 'Good is good, good is bad.', 'The principle of life should be consistent.', 'Purdue beings are the mission of philosophers.']