Los lubi chodzić krętymi drogami. Obwiniamy go w pierwszej chwili, że skłamał, z czasem zaś okazuje się, że mówił prawdę. - Denis Diderot

ولكنه شيء لا يُصدّق أن تشعري بكل هذا البغض لحالةٍ تؤدّين واجباتها بكل هذه بكل هذه السهولة والدقة

Morals are in all countries the result of legislation and government; they are not African or Asian or European: they are good or bad.

There are three principal means of acquiring knowledge available to us: observation of nature, reflection, and experimentation. Observation collects facts; reflection combines them; experimentation verifies the result of that combination. 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.