Meaning of the English proverb "Life is to death as pleasure is pain". I came across this phrase on a newspaper.
This is an anology.
Analogies are often of the form, "A is to B as C is to D". It asserts a correspondence or partial similarity between "Life" with "pleasure" and "death" with "pain".
As far as meaning, one take is that pain interrupts pleasure as death interrupts life, the latter permanently.