变得快乐的技巧几乎完全不同于不悲伤的技巧。
人类本性中最深层的原则是渴望被欣赏。
几个世纪以来，印第安人发展了手语来传达人们感兴趣的现象。来自不同部落（FORTRAN，LISP，ALGOL，SNOBOL等）的程序员可以使用不需要他们在小马上扛黑板的程序员。
The freedom then of man, and liberty of acting according to his own will, is grounded on his having reason, which is able to instruct him in that law he is to govern himself by, and make him know how far he is left to the freedom of his own will.
The highest purpose is to have no purpose at all. This puts one in accord with nature in her manner of operation.