One may see through a wall, if there’s a hole in it.
More German Proverbs:
If the shoe fits, wear it.German
As the twig is bent, so is the tree inclined.
German
Of what use is it that the cow gives plenty of milk, if she upset the pail.
German
With houses and gold, men are rarely bold.
German
Buying is cheaper than asking.
German
Between the anvil and the hammer.
German