Passage
and behold, thou shalt conceive in the womb and bear a son, and thou shalt call his name Jesus.
and behold, thou shalt conceive in the womb and bear a son, and thou shalt call his name Jesus.
Luke 1:29 But she, [seeing] [the angel], was troubled at his word, and reasoned in her mind what this salutation might be.
Luke 1:30 And the angel said to her, Fear not, Mary, for thou hast found favour with God;
Luke 1:31 and behold, thou shalt conceive in the womb and bear a son, and thou shalt call his name Jesus.
Luke 1:32 *He* shall be great, and shall be called Son of [the] Highest; and [the] Lord God shall give him the throne of David his father;
Luke 1:33 and he shall reign over the house of Jacob for the ages, and of his kingdom there shall not be an end.
The verse centers on "behold", "thou", "shalt", "conceive", "womb", and "bear". It is saying that the verse draws attention to "behold" and "thou", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 30's "And the angel said to her Fear..." into verse 32's "He shall be great and shall be...", so "behold" and "thou" 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 "behold" and "thou" with trust shaped by these words, not by a vague optimism outside the passage.