“The aspects of things that are most important for us are hidden because of their simplicity and familiarity. (One is unable to notice something because it is always before one’s eyes.) The real foundations of his enquiry do not strike a man at all”

“That it doesn’t strike us at all when we look around us, move about in space, feel our own bodies, etc. etc., shows how natural these things are to us. We do not notice that we see space perspectivally or that our visual field is in some sense blurred towards the edges. It doesn’t strike us and never can strike us because it is the way we perceive. We never give it a thought and it’s impossible we should, since there is nothing that contrasts with the form of our world.What I wanted to say is it’s strange that those who ascribe reality only to things and not to our ideas move about so unquestioningly in the world as idea and never long to escape from it.”

“Tell me," Wittgenstein's asked a friend, "why do people always say, it was natural for man to assume that the sun went round the earth rather than that the earth was rotating?" His friend replied, "Well, obviously because it just looks as though the Sun is going round the Earth." Wittgenstein replied, "Well, what would it have looked like if it had looked as though the Earth was rotating?”

“Nothing is more important for teaching us to understand the concepts we have than to construct fictitious ones.”

“I give no sources, because it is indifferent to mewhether what I have thought has already beenthought before me by another.”

“You must always be puzzled by mental illness. The thing I would dread most, if I became mentally ill, would be your adopting a common sense attitude; that you could take it for granted that I was deluded”

“Where two principles really do meet which cannot be reconciled with one another, then each man declares the other a fool and a heretic”