This kind of reflection results in your feeling ashamed before God should He see you where He has forbidden you to be, or miss you where He has commanded you to be. Know that you must reflect on your shortcomings in worshipping your Lord, and your exposing yourself to His wrath should you do what He has forbidden you.
I created jinn and men only to worship Me. (51:56)
Do you think We created you in vain, and that to Us you will not be returned? (23:115)
O man! What is it that has deceived you concerning your Generous Lord? (82:6)
This kind of reflection increases your fear of God, encourages you to blame and reproach yourself, to avoid remissness and persevere in your zeal.
Know that you must reflect on this worldly life, its numerous preoccupations, hazards, and the swiftness with which it perishes, and upon the hereafter, and its felicity and permanence.
Thus does God render the signs clear to you, that you may reflect on this world and the hereafter. (2:119-220)
But you may prefer the life of this world, when the hereafter is better and more abiding. (87:16-17)
The life of the world is but distraction and play; while the Last Abode is indeed the Life, if but they knew. (29:64)
This kind of reflection results in losing all desire for the world, and in wishing for the hereafter.
Know that you should reflect on the imminence of death and the regret and remorse which occur when it is too late.
Say: The death that you flee will indeed meet you, and you will then be returned to the Knower of the unseen and the seen, and He will inform you of that which you had been doing. (62:8)
Until, when death comes to one of them he says: 'My Lord! Send me back that I may do good in that which I have left!' No! It is but a word he says. (23:99-100)
O you who believe! Let not your wealth or your children distract you from the remembrance of God! up to: But God will not reprieve a soul whose time has come. (63:9-11)
The benefit of this kind of reflection is that hopes become short, behavior better, and provision is gathered for the Appointed Day.
Know that you should reflect on those attributes and acts by which God has described His friends and His enemies, and on the immediate and delayed rewards which He has prepared for each group.
The righteous are in felicity, and the depraved are in hell. (82:13-14)
Is the one who is a believer like the one who is corrupt? They are not equal. (32:18)
As for the one who gave, had taqwa, and believed in goodness, We shall ease him into ease, (92:5-7) up to the end of the sura.
The believers are those who, when God is mentioned, their hearts tremble, up to: they will have degrees with their Lord, and forgiveness, and generous provision. (8:2-4)
God has promised those among you who have believed and done good works that He will make them rulers over the earth as He made those before them rulers. (24:55)
Each we took for their sin; on some we sent a hurricane, some were taken by the Cry, some We caused the earth to swallow, and some We drowned. It was not for God to wrong them, but they wronged themselves. (29:40)
Hypocrite men and hypocrite women proceed one from another; they enjoin evil and forbid good, up to: God curses them, and theirs is a lasting torment. (9:67- 68)
Believing men and believing women are helping friends to each other; they enjoin good and forbid evil. up to: and good pleasure from God which is greater; that is the supreme gain. (9:71-72)
Those who do not expect to meet Us, are content with the life of the world and feel secure therein, up to: and the end of their prayer is, Praised be God, the Lord of the Worlds! (10:7-10)
The result of this kind of reflection is that you come to love the fortunate, habituate yourself to emulating their behavior and taking on their qualities, and detest the wretched, and habituate yourself to avoiding their behavior and traits of character.
Were we to allow ourselves to pursue the various channels of reflection we would have to forgo the brevity which we intended. That which we have mentioned should suffice the man of reason.