Sense of Surroundings

Descartes, a rationalist, and Hume, an empiricist, had a natural tendency to disagree, to say the least.
Descartes based his method of doubt and fundamental truths of existence upon rationalist logic; through the use of mathematics and deductive reasoning, Descartes came to doubt sense perception, reality, and the seemingly self-evident. He determined the one foundation upon all knowledge is cogito ergo sum, "I think, therefore I am."
On the other hand, Hume believed rational thought came after sensing the surrounding environment; therefore, logic must be based on impressions of one's sense perception, or that if one cannot experience knowledge or concepts then he/she cannot have them. Hume, as an empiricist, held believed that humans have no knowledge, only beliefs which are felt to be true. Empiricists use sensory observations and experimentation to draw conclusions.
Although Descartes' method of doubt is rational, his inability to recognize sensory impressions before deductive functions is not. Hume states that perception of the environment must come before rational functions: this is true because what is pure reason without the senses influences? Humans will never know because no human has ever or can ever experience and communicate logic without the influence and impressions of the senses. In addition, what if it is true that there is a demon who deceives all that we believe? The knowledge or concept of a deceiving demon is beyond the realm in which we can perceive and thus this knowledge is something which we cannot be concerned with. All of what we believe find their basis in what we can perceive because that is the only thing from which belief can stem. For example, Descartes' method of doubt stemmed from his belief that the senses deceive us; thus, his entire basis for a fundamental truth was based in how he perceived his senses.