Sanity

 Saying that there is a fine line between genius and insanity is like saying that there is a fine line between a powerful engine and a broken steering wheel. It's just nonsense. There is no connection or correlation.

What he said

 

... From Good Omens, the TV series (on Prime). Both that and the book by Pratchett and Gaiman are *warmly* recommended. 

Infinity?

The fact that you can't currently see the end of something does not mean that it is infinite.