Gardens beneath which rivers flow

"Their reward with Allah will be gardens of perpetual residence beneath which rivers flow, wherein they will abide forever, Allah being pleased with them and they with Him. That is for whoever has feared his Lord." (98:8)

جَنَّاتُ عَدْنٍ تَجْرِي مِنْ تَحْتِهَا الْأَنْهَارُ
gardens of perpetual residence beneath which rivers flow

This description of gardens beneath which rivers flow comes many times in the Quran.  But many people simply overlook this ayah [verse] and simply move on, but there is wisdom here which is quite profound. [1]

Do you await a day in which it would be no longer difficult to go against one's desires?

“Do you await a day in which it would be no longer difficult to go against one's desires? This is a day that Allah has never created, and nor will He ever create it! For the Paradise will always be covered with difficulties, and difficulties will never be easy upon the soul to bear. The existence of such is impossible!

Do you not ponder the time you have spent promising yourself? You say to yourself, “Tomorrow I shall, tomorrow I will!?!” Did you not recognize that tomorrow has arrived, and is now today. How have you received this tomorrow of yours? Did you not know that “tomorrow” which is now today is really yesterday? Verily that which you're incapable of achieving today, tomorrow you will be even further incapable of achieving!

This is because desires are like a firm tree which we have been enslaved to uproot. If one is incapable of fighting his desires and he delays this battle, it is like a person who delays uprooting a tree while he is young and strong; knowing the fact that this procrastination is only giving way for the tree to grow stronger and firmer, while he himself is growing weaker and weaker.”

Quote from Imam Al-Ghazzali's book Al-Ihyaa