“Nothing is so difficult as not deceiving oneself.”

“If people never did silly things nothing intelligent would ever get done.”

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

“But some of the greatest achievements in philosophy could only be compared with taking up some books which seemed to belong together, and putting them on different shelves; nothing more being final about their positions than that they no longer lie side by side. The onlooker who doesn’t know the difficulty of the task might well think in such a case that nothing at all had been achieved.”

“An honest religious thinker is like a tightrope walker. He almost looks as though he were walking on nothing but air. His support is the slenderest imaginable. And yet it really is possible to walk on it.”

“As there is only a logical necessity, so there is only a logicalimpossibility.”

“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.”