http://libfaqf556m6sqcme7kseel4zehmie6pkpu47bzbqzzaofn5xattfxad.onion/intro.html
Firstly, to indicate that we are not making up our claims of what certain anarchists thought or argued for. Secondly, and most importantly, it allows us to link the past voices of anarchism with its present adherents. And lastly, the quotes are used for their ability to convey ideas succinctly rather than as an appeal to "authority."