"Our observation of nature must be diligent, our reflection profound, and our experiments exact. We rarely see these three means combined; and for this reason, creative geniuses are not common"

This quote by Denis Diderot speaks to the importance of observation, reflection, and experimentation in the pursuit of understanding. He suggests that these three components are hardly ever combined, and that this is why innovative geniuses are not common. He is highlighting the requirement to be thorough in our observation of nature, to believe deeply and assess our observations, and to perform experiments to check our theories. By combining these 3 elements, we can get a much deeper understanding of the world around us and make creative discoveries. Diderot is recommending that if we want to put in the effort to observe, reflect, and experiment, we can become innovative geniuses ourselves.