解释：不可以不知道活着的乐趣，也不可以不知道虚度光阴的担忧。
人们对他们所爱的人最残忍。
你必须把失败看作开始和中间，但绝不要把它当作终点。
Peace is the highest good， because it is the state in which the mind is most fully in accord with its nature.
In the end, it is not the years in your life that count, but the life in your years.
"if you think tough men are dangerous, wait until you see what weak men are capable of.
A proposition is an assertion that something is or is not the case.