The world is a stage, but most of us are just stagehands.
Old minds are like old horses; you must exercise them if you wish to keep them in working order.
只保有你可一直携带的东西：掌握一些语言，熟悉一些国家，了解那些人民。让记忆成为你的行囊。
在计算中，不变量是短暂的。
The truth is rarely pure and never simple.
The world owes all its onward impulses to men ill at ease; the happy man inevitably confines himself within ancient limits.
