Hashem Protects Kayin

With an אות

Rashi says etched into his forehead

But doesn’t reveal which letter of Hashem’s Name

The Zohar says it was the letter vav

Also says it was אות הברית

The human condition is curable

רופא חולי עמו ישראל

The eighth brocho of shemoneh esreh

וישם יהוה לקין אות

Find the connection

And live it

אליו ולא למדותיו