You can’t get fish from a pear tree.
You can’t teach an old dog new tricks.
You can’t have your cake and eat it, too.
You can’t force oil and water to mix.
When the cats are away, the mice will play.
When in Rome, do as the Romans do.
Where there is no trust, there can be no love.
What you don’t know can actually hurt you.
Variety is the spice of your life,
And virtue is my only reward.
Trust is the mother of deceit.
There’s one law for the rich, and another for the poor.
They that dance must pay the fiddler.
Things are not always what they seem.
Those who live in glass houses should not throw stones.
To err is human, and time cures all things.