Passage
And he shall reign over the house of Jacob for ever; and of his kingdom there shall be no end.
And he shall reign over the house of Jacob for ever; and of his kingdom there shall be no end.
Luke 1:31 And, behold, thou shalt conceive in thy womb, and bring forth a son, and shalt call his name JESUS.
Luke 1:32 He shall be great, and shall be called the Son of the Highest: and the Lord God shall give unto him the throne of his father David:
Luke 1:33 And he shall reign over the house of Jacob for ever; and of his kingdom there shall be no end.
Luke 1:34 Then said Mary unto the angel, How shall this be, seeing I know not a man?
Luke 1:35 And the angel answered and said unto her, The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee: therefore also that holy thing which shall be born of thee shall be called the Son of God.
The verse centers on "shall", "reign", "over", "house", "jacob", "ever", and "kingdom". It is saying that the verse draws attention to "shall" and "reign", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 32's "He shall be great and shall be..." into verse 34's "Then said Mary unto the angel How...", so "shall" and "reign" belong inside that flow. In Luke context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "shall" and "reign" with trust shaped by these words, not by a vague optimism outside the passage.