If you happen to meet a crocodile, don't stick your head in its mouth. Every now and then, and who knows the reason, people ignore this advice, which is sad because they die, but very stupid because they were warned. They had a choice. The moral of the story is this - you can't afford to be stupid. There are crocodiles.
Advice to those about to build a Water-garden - DON'T. Not that the Water-garden is not a joy and a glory; but that it is cruelly hard to keep in order and control unless you are a master of millions and of broad ample acres of pool and pond. Water, like fire, is a good servant, perhaps, but is painfully liable to develop into a master.