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Every man (and woman) sins" is never a wrong notion.
So every man makes mistakes towards God's obedience, towards other people, and towards himself.
And man has to correct his mistakes: i.e. he should repent and regret his bad conduct... here if he does this, and asks God's forgiveness, it may be OK.
But if he continues with his mistakes and sins.. then his outcome will be bad.
"God forgives only the believer, but for the disbeliever He punishes him for every sin and every disobedience and will not forgive him."
God is Most Gracious and Most Merciful.
>> For the disbeliever who keeps to his disbelief and idolatry in addition to keep committing many sins without repenting: God will not forgive the idolater, the atheist and the associater who associates others with God in the worship.
>> While for the believer who devotes himself to God alone without associate or son or equal or patron, and if this believer works the righteous deeds and gives charity to the poor and needy... God will forgive him his sins when he repents and is Most Merciful to him and admits him into His Paradise.
Therefore, God is Most Merciful to the believer who devotes himself to Him alone without associate or son or daughters, when this believer works the righteous deeds and gives the charity.
But is not Merciful in the Next Life to the disbeliever, but will punish him severely for his sins, and will not wrong him any bit, but takes him to account for his evil work and his misery and his stinginess towards the poor and his transgression on others.
This is in the Next Life.
While
in this temporary material life, God is Most Gracious and is Merciful to both the believer and the disbeliever.
Both of them have family, sons and daughters, wives, wealth, houses, cars, health and many other bounties, to which the believer is grateful and the disbeliever is ungrateful.
Quran 1: 1, which means:
(
In the name of God Most Gracious c,
Most Merciful d.)
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c i.e. He shows mercy to both believers and unbelievers in the life of this World.
d His mercy, in the Next Life, involves only believers and does not involve unbelievers.
So the word (Most Gracious) is general, and the word (Most Merciful) is special.