Musar על פסחים 7:7

The matter of "Zeal" is clear. It is the early engaging in mitzvot and their completion as the sages of blessed memory said: "the zealous are early to perform the mitzvot" (Pesachim 4a).

And they said: "zealous people do Mitzvot as early as possible" (Pesachim 4a). Likewise, they said: "a person should always run to perform a mitzva, even on the Sabbath".

Zeal for the Torah and the commandments is a great quality, and so is zeal that aims to make a better world. And it is a quality of the righteous in the service of the Creator, may He be Blessed. Our Sages, of blessed memory, said : "The zealous are early to perform their religious duties" (Pesahim 4a).