I know that comma is usually used in the case when a phrase modifies "I" like (1).(nonrestrictive use) (1) Since in the morning meeting I, who was a manager, was assigned by my boss to fly urgently to Fukuoka, I immediately asked my secretary to book my airplane ticket to Fukuoka. But, in certain cases like (2,3), the phrases modifies proper "I" without commas. [quote from Three Days to See/ Helen Keller] (2) I who am blind can give one hint to those who see. [From Mark Noble, ?James Granger] (3) As to ghosts, I who have been in many churches by myself, in the dark dread midnight, with only a feeble candle, could never yet get a glimpse of one. Why aren't commas used in (2,3)?
Top answer
Think of it as an uncommon, rather literary, and even poetic way of saying something important about yourself. Sentences #2 and #3 have a literary feel. #1 does not.
— Clive
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