It is better to deal with a whole fool than half a fool.
More German Proverbs:
The most disorderly students make the most pious preachers.German
Where honour grows a span, folly grows an ell.
German
There are more old tipplers than old doctors.
German
The Hungarian is far too lazy to be bored.
German
The cat loves fish, but is loth to wet her feet.
German
Many cooks spoil the broth.
German