In general, we can think of data as defined by some collection of selectors and constructors, together with specified conditions that these procedures must fulfill in order to be a valid representation. -- SICP, What is meant by data?

It is better to be quiet and thought a fool than to open your mouth and remove all doubt. -- WikiHow

Lisp is a programmable programming language. -- John Foderaro

The venerable master Qc Na was walking with his student, Anton. Hoping to prompt the master into a discussion, Anton said "Master, I have heard that objects are a very good thing - is this true?" Qc Na looked pityingly at his student and replied, "Foolish pupil - objects are merely a poor man's closures." Chastised, Anton took his leave from his master and returned to his cell, intent on studying closures. He carefully read the entire "Lambda: The Ultimate..." series of papers and its cousins, and implemented a small Scheme interpreter with a closure-based object system. He learned much, and looked forward to informing his master of his progress. On his next walk with Qc Na, Anton attempted to impress his master by saying "Master, I have diligently studied the matter, and now understand that objects are truly a poor man's closures." Qc Na responded by hitting Anton with his stick, saying "When will you learn? Closures are a poor man's object." At that moment, Anton became enlightened. -- Anton van Straaten (Na = Norman Adams, Qa = Christian Queinnec)

Any sufficiently advanced technology is undistinguishable from magic. -- Arthur C. Clarke

An interpreter raises the machine to the level of the user program; a compiler lowers the user program to the level of the machine language. -- SICP

Either write something worth reading or do something worth writing. –Benjamin Franklin

As we look ahead into the next century, leaders will be those who empower others. ~Bill Gates

Successful entrepreneurs are givers and not takers of positive energy. ~Anonymous

Ask and it will be given to you; search, and you will find; knock and the door will be opened for you. –Jesus