critique of pure reason.

....and it is in this very kind of knowledge which transcends the world of the senses, and where experience can neither guide nor correct us, that reason prosecutes its investigations, which by their importance we consider far more excellent and by their tendency far more elevated than anything the understanding can find in the sphere of phenomena. Nay, we risk rather anything, even at the peril of error, than that we should surrender such investigations, either on the ground of their uncertainty, or from any feeling of indifference or contempt.

Now it might seem natural that, after we have left the solid ground of experience, we should not at once proceed to erect an edifice with knowledge which we possess without knowing whence it came, and trust to principles the origin of which is unknown, without having made sure of the safety of the foundations by means of careful examination.

Time is not a discursive, or what is called a general concept, but a pure form of sensuous intuition. Different times are parts only of one and the same time. Representation, which can be produced by a single object only, is called an intuition. The proposition that different times cannot exist at the same time cannot be deduced from any general concept. Such a proposition is synthetical, and cannot be deduced from concepts only. It is contained immediately in the intuition and representation of time.
~ always a pleasure to read Immanuel Kant

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