Spare the rod and spoil the child Link to proverb.
The bread always falls buttered side down.
Charity begins at home Link to proverb.
Fair exchange is no robbery Link to proverb.
The bigger they are, the harder they fall.
A swarm in May is worth a load of hay; a swarm in June is worth a silver spoon; but a swarm in July is not worth a fly.
Hard cases make bad law Link to proverb.