。
Prevention is better than cure.
Literal
Prevention [topic-は] cure-[than-に] surpass.
A direct translation of the English proverb, using まさる ('to surpass, be superior to'), a classical-feeling verb mostly found in proverbial and written register. Note that the standard being surpassed is marked with に, not より — with まさる (and 勝る) it's に for the thing exceeded. The short cadence makes it sound maxim-like.