What is the "comfort of the eyes" mentioned in the noble verse: "No soul knows what has been hidden for them of comfort for eyes," and is there an interpretation of this verse?

The phrase "comfort of the eye" refers to whatever brings joy and delight to the soul in terms of goodness and bliss. The meaning of the verse is that Allah has stored up for the believers, as a reward for their righteous deeds, that which no soul knows—that which will gladden the eye and expand the chest. This refers to the abundance of goodness and overflowing bliss that has been concealed for them as a comfort for their eyes, as stated in the Hadith Qudsi: "I have prepared for My righteous servants what no eye has seen, no ear has heard, and no human heart has ever conceived."