It could even be a quote he likes but I'm sure it's aimed at someone. Is it actually his official twitter?
It's definitely his official twitter! He seems a philosophical sort, it could be directed towards any range of current affairs.
If he was making a point about growing tensions in the middle east then he would probably have said so or posted a bit of Wilfred Owen. If he was slating politicians or the BBC then I'd expect something more pointed. The fact that it's so deliberately vague means something I think. I can only say that he REALLY doesn't like playing on the right flank!