I see that your visions have agreed on the last seven, so, whoever seeks it, let him seek it in the last seven

The merit of the Night of Qadr and the encouragement to seek it out.
Out of His wisdom and mercy, Allah has concealed this night so that people would be diligent in performing worship, seeking this night, and their reward would, thus, be abundant.
The Night of Qadr is in the last ten nights of Ramadan, and it is more likely to be in the last seven nights.
The Night of Qadr is one of the last ten nights of Ramadan. It is the night in which Allah Almighty revealed the Qur’an to the Prophet (may Allah's peace and blessings be upon him). He made this night better than a thousand months in its blessing, its immense significance, and the impact of good deeds performed therein.
It was named "the Night of Qadr,"  with a silent "d,"  either due to its honor, as one says: "so-and-so is of great 'qadr' (value or status)," making the addition of "night" an attribution of something to its quality, i.e., the noble night, signifying its immense status, grandeur, rank, etc. {Indeed, We sent it down on a blessed night.} [Surat ad-Dukhān: 3] Alternatively, it could be derived from "taqdīr" (decree), making the addition of the adverb to what it contains, i.e., it is the night in which the decree for the year is determined. {On that night, every matter of wisdom is determined.} [Surat ad-Dukhān: 4]