对民主的最大威胁不是来自外部敌人，而是来自内部腐败和公民美德的丧失。
The greatest threat to democracy is not from external enemies but from internal decay and the loss of civic virtue.
解析：主张统治者不应推崇贤能，不使人民争夺名位；不珍贵难得的财物，不使人民偷盗；不显耀足以引起贪心的事物，使民心不被扰乱。
我们唯一真正受到惩罚的谎言，是我们对自己说的那些。
"Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding."
Mental processes are tools for living, and their worth is in their use.