In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. - Galileo Galilei

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.

It is only in order to shield your ignorance that you put the Lord at every turn to the refuge of a miracle.

We cannot teach people anything; we can only help them discover it within themselves.