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I know I must let the children be attentive, but neglect the most terrible danger of children.
我知道必须让孩子们有所专心,怠慢乃是孩子们最可怕的危险。
The more you lose, the more you learn.
生活中最伟大的荣耀不在于从不跌倒,而在于每次跌倒后都能爬起来。
As in geometry the most natural way of beginning is from a mathematical point, so is the same method in observations and natural history the most genuine, simple, and instructive.