The man of your own trade is your enemy.
More Portuguese Proverbs:
The belly warm, the foot at rest.Portuguese
A friend's fault should be known but not abhorred.
Portuguese
One grain does not full the granary, but it helps its companion.
Portuguese
Marry, marry, sounds well but tastes ill.
Portuguese
If you laugh to-day, you will cry to-morrow.
Portuguese
Trust not a dog that limps.
Portuguese