“ If the matter is as clear to you as light that he comes to take life,
he is a murderer, and permission is given to save himself by [the murderer's] life.
But if the matter is uncertain to you as night, let him be in your eyes like a thief,
and permission is not given to save himself by [the thief's] life. ”

“ From the fact that Rabbi Yehudah said "from the time of sunrise,"
it is proven that the "light" which Rabbi Eliezer ben Yaakov spoke about is night.
No - what is "light?" Dawn.
If so, that which [Rabbi Eliezer ben Yaakov] said
"Now where have we found a day that part of it is forbidden in doing work, and part of it is permitted in doing work?" —
let him say it to himself; for there is the night, which is permitted [in doing work] . ”