All abstract sciences are nothing but the study of relations between signs.
Every man has his dignity. I'm willing to forget mine, but at my own discretion and not when someone else tells me to.
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.
Only passions, great passions can elevate the soul to great things.