“It is indeed an opinion strangely prevailing amongst men, that houses, mountains, rivers, and in a word all sensible objects have an existence natural or real, distinct from their being perceived by the understanding. But with how great an assurance and acquiescence soever this principle may be entertained in the world; yet whoever shall find in his heart to call it in question, may, if I mistake not, perceive it to involve a manifest contradiction. For what are the forementioned objects but the things we perceive by sense, and what do we perceive besides our own ideas or sensations; and is it not plainly repugnant that any one of these or any combination of them should exist unperceived?' (Berkeley, 1710: 25)”

“Whilst part of what we perceive comes through our senses from the object before us, another part (and it may be the larger part) always comes out of our own mind.”

“You perceive the world with your five senses. When your mind perceives the world, then the world exists before you. But if we are born without any senses, then how could we perceive the world except as a dream in our minds? But then...dreams often seem as real as the world we see now. Look...If I touch you with this hand, I can remember touching you, but I can't ever prove I did. If reality is nothing more than what is in our mind, then what is the difference between this world and a dream?”

“We perceive existence by means of words and names. To this or that vague, potential thing I will give a name, and it will exist thereafter, and its existence will be clearly perceived. The name enables me to see it. I can call it by its name, and I can see it for what it is.”

“The world is given to me only once, not one existing and one perceived. Subject and object are only one.”

“When we are unhurried and wise, we perceive that only great and worthy things have any permanent and absolute existence, that petty fears and petty pleasures are but the shadow of the reality.”