To be is to be perceived.
Esse est percipi.

Philosophers
George Berkeley
Anglo-Irish bishop and philosopher (1685-1753) whose dictum "to be is to be perceived" launched modern subjective idealism. With Locke and Hume he forms the British empiricist trio. Berkeley, California bears his name.
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George Berkeley's Other Quotes
Related Quotes
All is number.
-- Pythagoras
You will not find thinking apart from Being, in which it is expressed.
-- Parmenides
Philosophy is the knowledge of beings qua beings.
-- Farabi
I wish I had been born blind and then recovered my sight, so I could paint without knowing what the objects before me were.
-- Claude Monet
All determination is negation.
-- Benedictus de Spinoza
Exactitude is not truth.
-- Henri Matisse