Space by itself, and time by itself, are doomed to fade away into mere shadows, and only a kind union of the two will preserve an independent reality

A human being is a part of the whole, called by us "Universe", a part limited in time and space.

Matter tells space how to curve, space tells matter how to move.

My intellectual development was retarded, as a result of which I began to wonder about space and time only when I had already grown up.

Time and space are modes by which we think and not conditions in which we live

We come now to the question: what is a priori certain or necessary, respectively in geometry (doctrine of space) or its foundations? Formerly we thought everything; nowadays we think nothing. Already the distance-concept is logically arbitrary; there