Love, light, life- I reckon they all mean much the same thing.
Keble was one of the great men of the Victorian church- and the only one of the founders of the Oxford Movement who didn't eventually go over to the Catholics. His book of devotional verse, The Christian Year, was a 19th century best-seller. To my surprise- researching this post- I find that he lifted "new every morning" from the Old Testament- from the woebegone Book of Lamentations of all things. At least, I suppose it's woebegone, but I'm not sure I've ever read it. Perhaps it's all wonderfully affirmative.