Digging a hole for yourself.
More Traditional Proverbs:
If an ass goes travelling it will not come home a horse.
We didn't inherit the land from our fathers. We are borrowing it from our children.
A bird in the hand is bad table manners.
You will always be lucky if you know how to make friends with strange cats
Sitting on the fence.
Rebuke should have a grain more of salt than of sugar.
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The doctor demands his fees whether he has killed the illness or the patient.
Double charging will break a cannon.
If work were good for you, the rich would leave none for the poor.