Esther 1:8

None did compel : for so the king had appointed - Every person drank what he pleased; he was not obliged to take more than he had reason to think would do him good.

Among the Greeks, each guest was obliged to keep the round, or leave the company: hence the proverb Η πιθι, η απιθι ; Drink or begone. To this Horace refers, but gives more license: -

Pasco libatis dapibus; prout cuique libido est.

Siccat inaequales calices conviva, solutus

Legibus insanis: seu quis capit acria fortis

Pocula; seu modicis humescit aetius