It stole along so stealthy — Othello

It stole along so stealthy 1
Suspicion it was done
Was dim as to the wealthy
Beginning not to own-
(F.1497/J.1457)
[1] It:: a suspicious heart; the Suspicion in line 2. stole:: took away one's wealthy.
[2] done:: achieved, successful.
[3] dim:: darker to see, unable to see clearly.
[4] not to own:: to lose one's wealthy due to suspicion.