Aldous Huxley (1894-1963):
Man has lived only too frequently on his planet almost like a parasite living upon the host it infests.
And whereas many parasites are sensible enough not to destroy their host
(as, after all, if they kill their host, they destroy themselves)
man, instead, is not one of the sensible parasites.
So, he has lived at the expense of his host, to which he caused its absolute ruin.
Cited in PAN, No.40, August 2011, p.2