"Innocence always calls mutely for protection when we would be so much wiser to guard ourselves against it: innocence is like a dumb leper who has lost his bell, wandering the world, meaning no harm."

The personal example of a teacher is the most useful sunshine that nothing can replace for the soul of young people.

解释：生老病死，既不是外物的作用，也不是自己的力量，都是命运决定的，谁也无法改变。