If all we know and recollect are particular-sensation or particular impression, according to the Empiricist school of thought, it will be difficult, if not impossible to arrive at any necessary and universal knowledge. Put differently, it will be impossible to explain the possibility of any scientific knowledge as well as the relationship between cause and effect that enable the mind to grasp any scientific truth according to Kant.

With the critique of pure reason, Kant mean to determine the limits and scope of metaphysics which is the domain of reason , hence, when he talked about pure reason, he meant the faculty that embraces the a prior forms of knowledge which is the sources of the transcendental ideas compare to the intuitive reason.The same is true that Kant mean by the term "Critique"- the reflective examination of the validity and limits of human capacity. in a nutshell, Kant is of the view that free rational inquiry adequately support any essential human interest.

It will be observed that Kant, the German philosopher, has already had the answer to the question that bridges the gap between the two schools of thought, which is that of Rationalism and Empiricism. It is in that perspectives, that Kant prefigures the way human come to know things or objects. In his view, people are not passive perceive[b][/b] observing the world. In accepting the view of the Empiricist predecessor, our knowledge begins with experience, but it does not follow that it arises out of experience.

It must be observed that Empiricist is of the belief in the sense-perception, induction-from particular to general things and that there are no innate ideas. And that sense experience is the ultimate source of our concept and knowledge. On the other hand, Rationalism is of the belief in innate ideas, reason and deduction- from general to particulars. And of which in a significant way, concept and knowledge are gained independent of sense experience.

It will be observed however, that in the Out-side in-approach of the Empiricist; the object tends to cause the passive perceiver to have sensation according to John Locke, or impression according to Hume. But because of the categories of –Time and Space and with a kind of form of intuition, there seems to be imposed on experience principle by the human mind just to make sense out of it, and this is what he comes to call the –“Copernican Revolution”, and it was like when Copernican rejected the very idea that the sun revolved around the Earth.

In fact, Kant tends to solve the problem of how the mind acquires knowledge from experience by imposing principle upon experience to generate knowledge. Of cause, Kant is simply saying here that in order to have knowledge the mind must have a set of further organizing principles, that can be found in the faculty of understanding. The question is what is understanding?, Briefly, understanding takes time and energy to be acquired different from knowledge which is skill acquired through experience and education. Knowledge in Kant view is like a biscuit, which is the product of certain dough made of flour, and processed by a form of pressed biscuit.
The same is true, that knowledge is a product of content of which the senses feels and understand through space and time as a form of intuition that work in combination. According to Kant, the essential elements are both –a prior- beyond experience and a posterior- based on experience. It will be observed that without –sensation, object cannot be perceived and without understanding, object cannot be conceived.

In the Critique of Pure Reason, Kant asserted that thought with content and perception or the way object is noticed without conception or process of forming idea is but blindness. The same is true that understanding can perceive nothing just the same way as the senses can think of nothing. Hence knowledge can only arise from a united action because the mind has categories of understanding that codify and catalog to make sense of the world. According to Kant, the mind cannot not afford to experience anything that is filtered through the mind’s eye and we can never know the true nature of reality. Thus it follows that perception is reality, hence, what we are able to perceive and are aware of, is what act as reality.

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