Here we see St Jerome translating the Bible into Latin, from the original Hebrew and Greek.
As we follow his elongated arm, our eyes are directed to a reminder of our mortality.
It seems that no matter our calling in life, be a scholar or a shopkeeper, our ultimate mission remains the same.
We all bleed red.
Side note: The Saint seems to be so engrossed in his work, that he seems to dip his quill not into a jar of ink, but into the original manuscripts. Fitting.