“Man kann einen Menschen nichts lehren. Man kann ihm nur helfen, es in sich selbst zu finden!”

“In the sciences, the authority of thousands of opinions is not worth as much as one tiny spark of reason in an individual man.”

“I have never met a man so ignorant that I couldn't learn something from him.”

“You cannot teach a man anything; you can only help him find it within himself.”

“Toda verdad es fácil de comprender una vez que ha sido descubierta, el problema es descubrirla”

“Wer könnte beschwören, dass sie mit einem anderen Menschen glücklicher gewesen wären? Man kann sich trennen und man kann wieder zueinander finden. Man kann weggehen und man kann zurückkehren. Da ist nichts dabei. Nur wer ständig über vertane Jahre jammert, der verschwendet sein Leben.”

“Sì perché l'autorità dell'opinione di mille nelle scienze non val per una scintilla di ragione di un solo, sì perché le presenti osservazioni spogliano d'autorità i decreti de' passati scrittori, i quali se vedute l'avessero, avrebbono diversamente determinato.For in the sciences the authority of thousands of opinions is not worth as much as one tiny spark of reason in an individual man. Besides, the modern observations deprive all former writers of any authority, since if they had seen what we see, they would have judged as we judge.”