“Of course, all knowledge is useful. But not all knowledge is worth the cost.”

“All knowledge is worth having.”

“All Human Knowledge is precious whether or not it serves the slightest human use.”

“I feel that all knowledge should be in the free-trade zone. Your knowledge, my knowledge, everybody's knowledge should be made use of. I think people who refuse to use other people's knowledge are making a big mistake. Those who refuse to share their knowledge with other people are making a great mistake, because we need it all. I don't have any problem about ideas I got from other people. If I find them useful, I'll just ease them right in and make them my own.”

“All knowledge leads to self-knowledge.”

“...Writings can be stolen, or changed, or used for evil purposes. But isn't the risk worth taking? The more people who share knowledge, the greater safeguard for it. Isn't there more danger in ignorance than knowledge?”