Good deeds speak louder than good words.

Literal

Good words [than-より], good deeds [of-の] [subject-が] surpasses.

A proverb-like aphorism. ~より~のほうが勝る ('X surpasses Y' — literally 'the side of X surpasses Y more than'). の方 is the 'side, one' nominal used in comparative constructions. 勝る ('to surpass, exceed, be superior') is a moderately literary verb often appearing in such formal comparisons.