There are many remarkable ideas expressed here, during time. Some of them, which I wanted to mention, are already mentioned by others -- Satoshi quotes, for example.
However, I still have 2 quotes in my mind, which touched me when I first saw them. First of all is xtraelv's signature, which was also quoted by theymos (at forum's 10th anniversary, if I rember well; sadly, I can not find it now):
We are surrounded by legends on this forum. Phenomenal successes and catastrophic failures. Then there are the scams. This forum is a digital museum.
Second quote is philipma1957's signature:
I see BTC as the super highway and alt coins as taxis and trucks needed to move transactions.
I consider both as words of wisdom which can rarely be thought of a human mind.
Chapeau to xtraelv and philipma1957!
Last, but not least, I also want to mention DdmrDdmr's personal text, which is also an idea which caught my attention years ago:
There are lies, damn lies, and statistics.
It seems that he changed recently this personal text but, however, he had it for years