Fine gold is recognized when it is tested. - Leonardo da Vinci

The man who blames the supreme certainty of mathematics feeds on confusion, and can never silence the contradictions of sophistical sciences which lead to an eternal quackery.

The East will be seen to rush to the West and the South to the North in confusion round and about the universe, with great noise and trembling or fury.

Men born in hot countries love the night because it refreshes them and have a horror of light because it burns them; and therefore they are of the colour of night, that is black. And in cold countries it is just the contrary. Therefore you need complementary to find equal balance amongst everything.