An old monkey will not stick his hand into a jar.
More Portuguese Proverbs:
Change yourself, and your luck will change.Portuguese
There is no pleasure that does not pall, the more so if it costs nothing.
Portuguese
Better straw, than nothing.
Portuguese
It is approved alchemy to have an income and spend nothing.
Portuguese
Even the most beautiful sheets have small flaws.
Portuguese
Trust the virgin and don't run.
Portuguese