Evil isolated from the whole, good prevails

במדרש מצורע מוציא רע.

In the Midrash: "metzora" — one who "brings out evil" (motzi ra).

The Midrash reads the word metzora as a contraction of "motzi ra," one who brings forth evil — primarily through lashon hara. The Sefas Emes uses this to explore how good and evil are mixed within a person.

כי בכ"ד יש תערובת טו"ר.

For in every thing there is a mixture of good and evil.

Since the eating from the Eitz HaDa'as, everything in the world contains an admixture of good and evil intertwined.

וכן באדם.

And so too within a person.

The human being likewise contains this blend of good and evil within himself.

ומ"מ כמו שהוא בשורש הטוב גובר על הרע.

Nevertheless, as it is at the root, the good overpowers the evil.

At the deeper root of things, the good is dominant; the evil is secondary and subordinate.

כי מידה טובה מרובה.

For the measure of good is greater (Sotah 11a).

Chazal teach that Hashem's measure of good always exceeds the measure of punishment, so good inherently outweighs evil.

אבל צריכין ליזהר שלא להוציא הרע מן הכלל.

But one must be careful not to draw the evil out from the klal (the collective whole).

The danger is in isolating the evil, removing it from the unifying whole. Within the klal, the good prevails; but once evil is singled out and separated, it gains a foothold.

וכן כתיב נצור לשונך מרע כו' בקש שלום הוא הביטול אל הכלל וכן כתיב בטהרת מצורע שתי צפרים חיות.

And so it is written, "Guard your tongue from evil… seek peace [and pursue it]" (Tehillim 34:14-15) — this is the bittul (nullification of self) toward the klal; and so it is written regarding the purification of the metzora, "two living birds" (Vayikra 14:4).

Guarding the tongue and "seeking peace" mean nullifying oneself into the collective whole, where evil cannot take hold. The metzora's purification with two living birds points to this return — bringing the separated person back into living connection.

המים החיים.

The living waters.

Likewise the "living waters" used in his purification symbolize reconnection to the living source.

הכל לחזור להתדבק בשורש.

All of this is in order to return and cleave to the root.

Every element of the metzora's purification serves one purpose: to bring him back to cleave to his root and to the klal.

וכשהוא בתוך הכלל יכול ליתקן:

And when he is within the klal, he can be set right.

Once the person is reintegrated into the collective whole, where the good prevails, his rectification (tikkun) becomes possible — the evil loses its grip and the good overpowers it.

Summary: The metzora "brings out evil" by isolating it. Although everything contains a mixture of good and evil, at the root the good overpowers the evil, because the measure of good is greater. The sin lies in drawing the evil out of the unifying whole. Guarding the tongue, seeking peace, and the metzora's purification with living birds and living waters all express bittul to the klal — and only by returning to cleave to the root, within the collective whole, can a person be set right.