Sextus Empiricus was subversive to reason, in that his 'prime directive' was the suspension of judgement regarding any belief system based on faith alone. This is the Pyrrhonian Standard, which extends itself to the concept that God may or may not exist, but that claims for His existance or non-existance are not naturally true.
So, rather than address himself to questions like "Does God exist?", he advocates avoidance of the entire "God question."
And, there are TEN tropes. For example...
1. Different animals manifest different modes of perception;
2. Similar differences are seen among individual men;
3. For the same man, information perceived with the senses is self-contradictory
4. Furthermore it varies from time to time with physical changes
5. In addition, this data differs according to local relations
6. Objects are known only indirectly through the medium of air, moisture, etc.
7. These objects are in a condition of perpetual change in colour, temperature, size and motion
8. All perceptions are relative and interact one upon another
9. Our impressions become less critical through repetition and custom
10. All men are brought up with different beliefs, under different laws and social conditions
Sextus' assertion is that truth varies infinitely under circumstances whose importance to one another cannot be accurately judged by human observers. He therefore rejects any concept of absolute knowledge, since every man has different perceptions, and he arranges this sense-gathered data in methods peculiar to himself. An idea of truth for him thus becomes purely subjective.
Thus, Sextus relies more on Qualia than Quanta - more on the perceptive experience than any measureable experiment.