Hakuin
Someone asked Hakuin "Why does someone who is originally a Buddha suddenly become a sentient being?" "It is a mistake on the part of his parents," said Hakuin.
He also used to say "The words and phrases that I speak are a ration of unchewable nails. You couldn't possibly get your teeth into them." And "You can no longer find a single man who is capable of facing a person and clearly judging him before he has made a move or said a word. They have disappeared completely. What a terrible pity!"
It is said that Hakuin's poison is so virulent that the slightest drop, even a word, can kill everything in the Universe. Personally, I think he was too soft.