also: えいさめのみずげこしらず
expression
a teetotaler doesn't know how good water tastes after drinking
Proverb meaning that someone who never drinks cannot appreciate the relief or pleasure that water brings to a hungover person; used to say that you cannot understand something without experiencing it.
「酔い醒めの水下戸知らず」というように、経験しないとその良さはわからないものだ。
As the proverb goes, 'A teetotaler doesn't know how good water tastes after drinking' — you can't appreciate something without experiencing it.