Practice makes the master.
In German: 'Übung macht den Meister.' The word Meister comes from the old craft guilds, in which an apprentice (Lehrling) became a journeyman (Geselle) and, after years of work, could qualify as a master. The proverb packs that path into four words: skill is built by repetition, not handed out as a gift. English says 'practice makes perfect'.

