The cow drinks water and it turns to milk; the snake drinks water and it turns to poison.
More Japanese Proverbs:
Making money is like digging with a needle.Japanese
If you never climb Mt. Fuji, you're a fool, and if you climb it more than once, you're a crazy fool.
Japanese
A merry companion on the road is as good as a nag.
Japanese
Even when a samurai has not eaten, he holds his toothpick high.
Japanese
Consider the facts seven times before you suspect someone.
Japanese
Poverty is no sin, but terribly inconvenient.
Japanese