[18].Surah Al-Kahf [The Cave]: Ayat 106-108

Ayat 106. "That shall be their recompense, Hell; because they disbelieved and took My Ayat (proofs, evidences, verses, lessons, signs, revelations, etc.) and My Messengers by way of jest and mockery.

Ayat 107. "Verily! Those who believe (in the Oneness of Allah Islamic Monotheism) and do righteous deeds, shall have the Gardens of Al-Firdous (the Paradise) for their entertainment. 

Ayat 108. "Wherein they shall dwell (forever). No desire will they have to be removed therefrom." 

[Tafseer] False motives, pretence, deception, and hypocrisy, flourish because people do not take the higher life seriously. Tn effect they treat it as ajest. Signs and Messengers are sent as a special and personal Mercy from Allah, and for such things the first person singular is used as in this verse, even when it involves a sudden transition from the first person plural as in the last verse. Firdaws in Persian means an enclosed place, a park. In technical theological language the word is used for the inner circle of Heaven, or the highest Heaven, the destination of those who perfectly fulfil both requirements, viz.: a sound faith, and perfectly righteous conduct. Small faults in either respect are forgiven; the Mercy of Allah steps in.

Hazrat Abu Sa`id Al-Khudri (May Allah be pleased with him) said: Messenger of Allah [SAWW](PBUH) said, "Allah, the Rubb of honour and glory, will say to the inhabitants of Jannah: `O inhabitants of Jannah!' They will respond: `Here we are! At Your service, O our Rubb. All good is in Your Hand!' He will ask them: `Are you pleased?' They will reply: `Why should we not be pleased, O Rubb, when You have given us what You have not given to any of Your creatures?' Allah will say: `Shall I not give you something better than that?' They will ask: `O Rubb! What can be better than that?' Allah will say: `I shall bestow My Pleasure upon you and I shall never be displeased with you.''

[Al-Bukhari Book 08, Chapter 76, Hadith # 557]. 

Lesson : as mentioned above in Surah Al-Kahf Ayat 107."shall have the Gardens of Al-Firdous (the Paradise) for their entertainment" The declaration about Allah being pleased with the dwellers of Jannah will certainly be the greatest of the boons and rewards of Jannah.