Before I had studied Chan (Zen) for thirty years, I saw mountains as mountains, and rivers as rivers. When I arrived at a more intimate knowledge, I came to the point where I saw that mountains are not mountains, and rivers are not rivers. But now that I have got its very substance I am at rest. For it's just that I see mountains once again as mountains, and rivers once again as rivers.
-- Qingyuan Weixin
There is something to be learned from a rainstorm. When meeting with a sudden shower, you try not to get wet and run quickly along the road. But doing such things as passing under the eaves of houses, you still get wet. When you are resolved from the beginning, you will not be perplexed, though you will still get the same soaking. This understanding extends to everything.
-- Tsunetomo Yamamoto, Hagakure
...all models are approximations. Essentially, all models are wrong, but some are useful.
-- George E.P. Box
Probability does not exist
-- Bruno de Finetti