A little knowledge is a dangerous thing.
More Portuguese Proverbs:
A goose, a woman, and a goat, are bad things lean.Portuguese
Fools sometimes give wise men counsel.
Portuguese
A little leak will sink a great ship.
Portuguese
Peace with a cudgel in hand is war.
Portuguese
Let every one be content with what God has given him.
Portuguese
The fisherman fishes in troubled water.
Portuguese