Space then is a necessary representation a priori, which serves for the foundation of all external intuitions. We never can imagine or make a representation to ourselves of the non-existence of space ... It must, therefore, be considered as the condition of the possibility of appearances ... [p. A29/B45] Time is a necessary representation, lying at the foundation of all our intuitions. With regard to appearances in general, we cannot think away time from them, ... time is therefore given a priori. In it alone is all reality of appearances possible.
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Published before 1923