To be is to be perceived (Esse est percipi)." Or, "If a tree falls in the forest and no one is there to hear it, does it make a sound?
George BerkeleyWhat doubts, what hypotheses, what labyrinths of amusement, what fields of disputation, what an ocean of false learning, may be avoided by that single notion of immaterialism!
George BerkeleyAll that stock of arguments [the skeptics] produce to depreciate our faculties, and make mankind appear ignorant and low, are drawn principally from this head, to wit, that we are under an invincible blindness as to the true and real nature of things.
George BerkeleyThe real essence, the internal qualities, and constitution of even the meanest object, is hid from our view; something there is inevery drop of water, every grain of sand, which it is beyond the power of human understanding to fathom or comprehend. But it is evidentthat we are influenced by false principles to that degree as to mistrust our senses, and think we know nothing of those things which we perfectly comprehend.
George Berkeley