There is no absolute up or ...

There is no absolute up or down, as Aristotle taught; no absolute position in space; but the position of a body is relative to that of other bodies. Everywhere there is incessant relative change in position throughout the universe, and the observer is always at the center of things.
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 Giordano Bruno

Quotes from the same author

Time is the father of truth, its mother is our mind.
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 Giordano Bruno
What can be more stupid than to be in pain about future things and absent ones which at present are not felt?
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 Giordano Bruno
My son, I do not say these are foals and those asses, these little monkeys and those great baboons, as you would have me do. As I told you from the first, I regard them as earth's heroes. But I do not wish to believe them without cause, nor to accept those propositions whose antitheses (as you must have understood if you are not both blind and deaf) are so compellingly true.
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 Giordano Bruno
You explain right well, and you shew that you understand argument and are not a mere sophist since you accept that which cannot be denied.
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 Giordano Bruno
Of the eternal incorporeal substance nothing is changed, is formed or deformed, but there always remains only that thing which cannot be a subject of dissolution, since it is not possible that it be a subject of composition, and therefore, either of itself or by accident, it cannot be said to die.
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 Giordano Bruno