What an amazing thought! We will never be left alone, comfortless. We will always have someone there; Christ will come to us. What really intrigued me though was following further the actual words, particularly, comfortless. Again the LDS King James version of the Bible [which I will usually refer to, just to let you know !] has a footnote for that particular word. The footnote read "Greek: Orphans." So, if you interchange those two, "I will not leave you orphans."
Now to me that is an amazing thought! When I picture an orphan I picture a small, poor child, so alone, with no family, no one at all, struggling. Granted I take on the stereotypical 1800's English orphan but that's my first mental image. And Christ will never leave us as orphans, ever. We will always have someone, Him. We will always have a family, wonderful Heavenly Parents, and a loving Elder Brother.
In a world where families are torn apart, unknown and constantly changing, it's such a comfort to now we will never be alone, we will never be orphans and we will never be comfortless.