From 1 to 5 words selected, the Lookup action is shown in the Selection menu.
A one word selection can produce results in dictionaries via word Lookup, usually, but can produce an empty (no results) Power Lookup.
For phrases, results are less predictable:
Phrase Bible Non-bible
grace and mercy Power Lookup --> empty Power Lookup --> empty
grace may abound Power Lookup --> empty Power Lookup --> empty
grace of God Word Lookup (grace) Word Lookup (grace)
Jesus died Power Lookup --> empty Power Lookup --> empty
Jesus Christ Word Lookup (Jesus Christ) Word Lookup (Jesus Christ)
However, a consistently empty Power Lookup is not a desirable result.
"grace of God" turns out to be a (LCV) topic equivalent to Grace, but it doesn't list Dictionaries (and Guides) in the Context menu; unlike Grace. Will this inconsistency remain?
"Jesus Christ" is equivalent to "Jesus", so one may get results for Jesus in Bible Dictionaries, depending on their priority. But the Context menu only lists dictionaries and guides for Jesus.