"He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his candle at mine, receives light without darkening me. No one possesses the less of an idea, because every other possesses the whole of it." - Jefferson
But many people do benefit greatly from hoarding or controlling the distribution of scarce information. If you make your living off slavery instead, then of course you can be generous with knowledge.
Here's the new thread for posting quotes, with the usual rules: