How did Ivan Ivanovich get his conscience?

Как к Ивану Ивановичу совесть пришла

Also known as Kak k Ivanu Ivanovichu sovest prishla

To a man who has never made mistakes, suddenly comes the conscience in the guise of his illegitimate blind son, and now in the life of the hero one mistake follows another. Conscience is an ill-mannered and insolent boy who comes when you do not expect him at all.