Quotations by:
Chekhov, Anton
A grimy fly can soil the entire wall and a small, dirty little act can ruin the entire proceedings.
One must be a god to be able to tell successes from failures without making a mistake.
Anton Pavlovich Chekhov (1860-1904) Russian playwright and writer
Letter (Nov 1888)
(Source)
Alt. trans.: "You have to be a god to distinguish the successes from the failures without making a mistake."