He who has a mind to beat a dog will easily find a stick.
More Italian Proverbs:
An idle man is the devil's bolster.Italian
Years know more than books.
Italian
Muddy water won't do for a mirror.
Italian
Who has no money must have no wishes.
Italian
A good horse and a bad horse need the spur; a good woman and a bad woman need the stick.
Italian
Among thorns grow roses.
Italian