Кто может украсть теленка, украдет и корову

Once a person commits a little theft, he may well become a real thief

Var.: Кто украдёт яйцо, тот украдёт и лошадь. Кто украл яйцо, украдёт и курицу

Cf: Не that steals an egg will steal a chicken (an ox) (Am.). Не that will steal an egg, will steal an ox (Br.). Не that will steal an ounce will steal a pound (Am.). Не that will steal a pin will steal a better thing (Am.). Не that will steal a pin will steal a pound (Br.). Little rogues easily become great ones (Am.)