The most refined abstractions ...

The most refined abstractions of logic conduct to a view of life, which, though startling to the apprehension, is, in fact, that which the habitual sense of its repeated combinations has extinguished in us. It strips, as it were, the painted curtain from this scene of things. I confess that I am one of those who are unable to refuse my assent to the conclusions of those philosophers who assert that nothing exists but as it is perceived.
The most refined abstractions of logic conduct to a view of life, which, though startling to the apprehension, is, in fact, that which the habitual sense of its repeated combinations has extinguished in us. It strips, as it were, the painted curtain from this scene of things. I confess that I am one of those who are unable to refuse my assent to the conclusions of those philosophers who assert that nothing exists but as it is perceived.
 Percy Bysshe Shelley

Quotes from the same author

Fear not for the future, weep not for the past.
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 Percy Bysshe Shelley
I am the daughter of Earth and Water, And the nursling of the Sky; I pass through the pores of the ocean and shores; I change, but I cannot die. For after the rain when with never a stain The pavilion of Heaven is bare, And the winds and sunbeams with their convex gleams Build up the blue dome of air, I silently laugh at my own cenotaph, And out of the caverns of rain, Like a child from the womb, like a ghost from the tomb, I arise and unbuild it again.
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 Percy Bysshe Shelley
But hope will make thee young, for Hope and Youth Are children of one mother, even Love.
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 Percy Bysshe Shelley
In the firm expectation that when London shall be a habitation of bitterns, when St. Paul and Westminster Abbey shall stand shapeless and nameless ruins in the midst of an unpeopled marsh, when the piers of Waterloo Bridge shall become the nuclei of islets of reeds and osiers, and cast the jagged shadows of their broken arches on the solitary stream, some Transatlantic commentator will be weighing in the scales of some new and now unimagined system of criticism the respective merits of the Bells and the Fudges and their historians.
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 Percy Bysshe Shelley
Gentleness, Virtue, Wisdom, and Endurance, These are the seals of that most firm assurance Which bars the pit over Destruction's strength; And if, with infirm hand, Eternity, Mother of many acts and hours, should free The serpent that would clasp her with his length; These are the spells by which to reassume An empire o'er the disentangled doom.
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 Percy Bysshe Shelley