The quote is good but I can't help but be bothered by the source, and wonder if rationality is really on display here.
Democritus may have had an atomic theory, but his reasons for having it were no better than those for the "earth, wind, fire and water" theory; i.e., wild conjecture.
That's not true. He had perfectly good reasons for atomism in his context.
The ontological arguments of Parmenides (and as exposited by Melissus) lead to extremely unpalatable, if not outright contradictory, conclusions, such as there being no time or change or different entities. The arguments seem valid, and most of their premises are reasonable, but one of his most important and questionable premises is that void cannot exist.
Reject that premise and you are left with matter and void. How are matter and void distributed? Well, either matter can be indefi...
This is our monthly thread for collecting these little gems and pearls of wisdom, rationality-related quotes you've seen recently, or had stored in your quotesfile for ages, and which might be handy to link to in one of our discussions.