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.
Wandering in a vast forest at night, I have only a faint light to guide me. A stranger appears and says to me: ‘My friend, you should blow out your candle in order to find your way more clearly.’ This stranger is a theologian.
