In the Name of Allah, The Most Gracious, Most Merciful
(Seek Lailat-ul-Qadr (Night of Decree) in the odd nights out of the last ten nights of Ramadan.)
Seeking al-Qadr night during the last ten nights of Ramadan encourages man to strive and to obey Allah the Almighty. The secret behind concealing its time is to make us strive more in Ramadan, and this perseverance reaches its peak and its utmost reaction with Allah the Almighty when we are in the last ten days of Ramadan.
You should know Allah the Almighty on al-Qadr night which crowns many days during when you endeavored to listen to the Quran and to recite it in Tarawih Salah. In order to know Allah the Almighty on al-Qadr night, you should know Him as you should be and this is achieved by pinning your hopes only on Him, putting your trust only in Him, seeking guidance only from Him, submitting yourself only to His Way, and fearing none but Him.