[20].Surah Taha [Tâ-Hâ]: Ayat 98-101

Ayat 98. Your Ilah (God) is only Allah, the One (Lâ ilaha illa Huwa) (none has the right to be worshipped but He). He has full knowledge of all things.

Ayat 99. Thus We relate to you (O Muhammad [SAWW](PBUH) some information of what happened before. And indeed We have given you from Us a Reminder (this Qur'an).

Ayat 100. Whoever turns away from it (this Qur'an i.e. does not believe in it, nor acts on its orders), verily, they will bear a heavy burden (of sins) on the Day of Resurrection,

Ayat 101. They will abide in that (state in the Fire of Hell), and evil indeed will it be that load for them on the Day of Resurrection;

[Tafseer] (Your God is only Allah, than Whom there is no other God) He has no children or partners. (He embraceth all things in His knowledge) He knows all things. (Thus relate Who unto thee) in this way we sent you, O Muhammad [SAWW](PBUH), Gabriel with (some tidings of that which happened of old) with the events of past nations, (and We have given thee from Our presence a Reminder) We have honoured you with the Qur'an which contains the events of past and future generations. (Whoso turneth away from it) whoever disbelieves in it, (he verily will bear a burden) idolatry (on the Day of Resurrection) (Abiding under it) abiding in the punishment for committing idolatry, (an evil burden for them on the Day of Resurrection) their sins are an evil burden for them on the Day of Resurrection, But the god of you all is the One Allah. there is no god but He: all things He comprehends in His knowledge. Thus do We relate to thee some stories of what happened before: for We have sent thee a Message from Our own Presence. Thus superseding previous revelations; for this (the Qur'an) is direct from Allah, and is not a secondhand exposition on other men's authority. If any do turn away therefrom, verily they will bear a burden on the Day of judgment; If people are so immersed in the evanescent falsehoods of this life to turn away from the True and the Eternal, they will have a rude awakening when the Judgement comes. These very things that they thought so enjoyable here— taking advantage of others, material self-indulgence, nursing grievances instead of doing good, etc., etc.—will he a grievous burden to them that day, which they will not be able to escape or lighten.

Hazrat Anas (May Allah be pleased with him) reported: The Messenger of Allah [SAWW](PBUH) said, "When one of you supplicates, let him be decisive and he should not say: `O Allah, bestow upon me such and such if You wish', because no one has the power to compel Him.''

[Al-Bukhari Book 08, Chapter 75, Hadith # 350] 

Lesson : as mentioned above in Surah Taha Ayat 98."He has full knowledge of all things" One should pray to Allah will full confidence that He will answer his prayers. One should also persist in praying and never give in to despair.