Do not tell all that you know, don’t believe all you hear, and don’t do all that you can.
More Portuguese Proverbs:
Give a man rope enough and he will hang himself.Portuguese
You can't make horn of a pig's tail.
Portuguese
Much coin, much care.
Portuguese
The worth of a thing is what it will bring.
Portuguese
A contented ass enjoys a long life.
Portuguese
To the bold man Fortune holds out her hand.
Portuguese