The night of Al-Qadr (Decree) is better than a thousand months (i.e. worshipping Allah in that night is better than worshipping Him a thousand months, i.e. 83 years and 4 months)
The Night of Power is better than a thousand months
Al-muntakhab fi tafsir al-Qur'an al-Karim
Deeds imprinted with wisdom and piety (like supplication, benevolence, pondering, acquirement of knowledge, at that night) merit a reward outweighing the reward due for like deeds accomplished for one thousand months