Here is one hand, and here is another.

Philosophers
G. E. Moore
Cambridge philosopher (1873-1958), with Russell and Wittgenstein a founder of analytic philosophy. Principia Ethica launched metaethics with the naturalistic fallacy; "Here is one hand" is his iconic reply to scepticism.
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G. E. Moore's Other Quotes
Good is good, and that is the end of the matter.
By far the most valuable things, which we know or can imagine, are certain states of consciousness, which may be roughly described as the pleasures of human intercourse and the enjoyment of beautiful objects.
It is raining, but I don't believe that it is raining.