Carl Sandburg once wrote 'Only the fire-born understand blue.' 

I was confused when I first read that, but as I thought about it more, I understood its meaning. The quote means, in my perspective, that... When children draw fire, they use orange, red and yellow, but the hottest part of the fire, the most dangerous part, is the middle, where it's blue.  

But only those who have been burned by fire can understand how dangerous blue can be.