It is better, of course, to know useless things than to know nothing.

It makes a great deal of difference whether one wills not to sin or has not the knowledge to sin.

Other men's sins are before our eyes; our own are behind our backs.

Timendi causa est nescire -
Ignorance is the cause of fear.

The time will come when diligent research over long periods will bring to light things which now lie hidden. A single lifetime, even though entirely devoted to the sky, would not be enough for the investigation of so vast a subject... And so this knowledge will be unfolded only through long successive ages. There will come a time when our descendants will be amazed that we did not know things that are so plain to them... Many discoveries are reserved for ages still to come, when memory of us will have been effaced.

It makes a great deal of difference whether one wills not to sin or has not the knowledge to sin.