When they forget Him, He will cause them to forget themselves⁷

6) It causes the removal of bounties and brings about calamities:

Ali (may Allah be pleased with him) said: ‘No calamity has ever come except due to sin and no calamity is ever removed except with repentance.’
Whatever befalls you then it is due to what yourselves have earned and he forgives much.⁸
Allah does not change the condition of a people until they change what is within themselves.⁹
Allah does not wrong His slaves in the slightest.¹⁰

7) Cause of man to always be the prisoner of Shaitân, he is imprisoned and shackled due to his whims and desires:

None is safe from sinning; we are not angels nor were we created to be angels. However, we need to take heed of belittling sins and seeing them, even what we consider to be the small ones, as insignificant. The Prophet said: ‘Beware of belittling small sins, for indeed they come together upon a person until they destroy him.’¹¹

‘A woman was punished due to a cat. She imprisoned it until it died and therefore entered the fire. She didn’t feed it, nor give it drink when she imprisoned it nor did she let it go out and eat from the provision of Allah.’¹²

‘Indeed when a believers sins a black spot is put in his heart, if he repents, seeks forgiveness and restrains himself his heart is cleaned. However, if he continues it increases in size, until it overcomes his heart. That is the Raan (rust) mentioned in the saying of Allaah: ‘Nay, rust is upon the hearts due to what they used to do.’¹³

‘Indeed, every son of Adam is a sinner, however the best of sinners is the one who repents.’¹⁴

Sins are dangerous and lead to destruction. {quotes}They may cause some enjoyment in the short term but the long term effects are detrimental to ones life and soul.{/quotes}

Every person knows themselves best. They know what they have earned of good and what they have done of evil. One should not become arrogant when praised, rather forget about praise, and forget about what others think about you. Think of the times you were alone and you disobeyed your Creator, your Sustainer, the One upon whom your very existence depends. None saw you except He, none knows it but He, perhaps even you have forgotten but your Lord never forgets. What led you to this evil? What made it seem alluring to you? Could it be that your worst enemy is your own soul?

Know that you can always escape from the prison of sins and be free. The sins and their master have no true hold upon you except the hold you give them. Cling to obedience and shun off transgression. Truly understand that ‘Verily, Shaytan is an enemy to you, so take him as an enemy.’¹⁵ If you fall short, if you sin then know that you have the power to erase your sin by repenting to your Lord and atoning for it.

‘The one who repents is like the one without sin.’¹⁶

‘Indeed your Lord is amazed by his slave when he says; forgive me my sins, and the slave knows full well that none can forgive sins but He.’¹⁷

‘Say to my believing slaves who have wronged their own souls, do not despair from the mercy of your Lord! Indeed, Allah forgives all sins, indeed He is oft-Forgiving, Most Merciful.’¹⁸

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^{source: www.islam21c.com}