The senses are a kind of reason. Taste, touch and smell, hearing and seeing, are not merely a means to sensation, enjoyable or otherwise, but they are also a means to knowledge - and are, indeed, your only actual means to knowledge.
You can only know a good wine if you have first tasted a bad one.
The ancient saying, "There is nothing in the intellect which was not first in some way in the senses," and senses being explorers of the world, opens the way to knowledge.
Gradually the conviction gained recognition that all knowledge about things is exclusively a working-over of the raw material furnished by the senses. ... Galileo and Hume first upheld this principle with full clarity and decisiveness.
For many ages it has been allowed by sensible men, Nihil est in intellectu quod non fuit prius in sensu: That is, There is nothing in the understanding which was not first perceived by some of the senses. All the knowledge which we naturally have is originally derived from our senses. And therefore those who want any sense cannot have the least knowledge or idea of the objects of that sense; as they that never had sight have not the least knowledge or conception of light or colours.
The senses do not enable us to cognize any entity in its Being; they merely serve to announce the ways in which 'external' Things within-the-world are useful or harmful for human creatures encumbered with bodies....they tell us nothing about entities in their Being.
If we look at the realm of knowledge, how exceedingly small and limited is that part acquired through our own senses; how wide is that we gain from other sources.
All our knowledge begins with the senses...
Can the knowledge deriving from reason even begin to compare with knowledge perceptible by sense?
Every principle is a judgment, every judgment the outcome of experience, and experience is only acquired by the exercise of the senses; whence it follows that religious principles bear upon nothing whatever and are not in the slightest innate. Ignorance and fear, you will repeat to them, ignorance and fear - those are the twin bases of every religion.
