The idea of copyright did not exist in ancient times, when authors frequently copied other authors at length in works of non-fiction. This practice was useful, and is the only way many authors' works have survived even in part.

The most powerful programming language is Lisp. If you don't know Lisp (or its variant, Scheme), you don't appreciate what a powerful language is. Once you learn Lisp you will see what is missing in most other languages.

To be able to choose between proprietary software packages is to be able to choose your master. Freedom means not having a master.

I have met bright students in computer science who have never seen the source code of a large program. They may be good at writing small programs, but they can't begin to learn the different skills of writing large ones if they can't see how others have done it.

Free software is software that respects your freedom and the social solidarity of your community. So it's free as in freedom.

There is no system but GNU and Linux is one of it's kernels

Sharing knowledge is the most fundamental act of friendship. Because it is a way you can give something without loosing something.