الْكِتَابَ قَرَأْتُ
The book—I read it.
إِيَّاكَ نَعْبُدُ
You alone we worship.
Both sentences front an object. The first may merely topicalize a book, or restrict the reading to that book when contrasted with another. The second strongly expresses exclusivity in its devotional context.
One grammatical construction can serve more than one rhetorical purpose. A form should not be given the same unconditional interpretation in every setting.