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It says: "...because Allah has made some of them to excel others ..." And, in the second part of the statement it implies that this guardianship is for the sake of the responsibilities that men undertake along the side of financial payments due to women and family members.
It says: "...and because they spend out of their property (for the support of women) ..." Then, it adds that: with respect to the duties women undertake at home, they are divided into two groups: The first group are those pious women who, because of the rights Allah has set for them, are humble and protect the secrets and rights of their husband when the husband is absent: "...therefore, the good women are obedient, guarding the unseen as Allah has guarded ..." That is, always, and at the absence of their husbands in particular, they commit no treachery whether from the point of property, or honour, or protecting the family secrets, and the credit and personality of their husbands.
They also truly follow their duties and responsibilities to fulfil them well. The second group are the women who usually refuse to do their duties. Thus, the signs of disagreement and discord are seen in them. Confronting such women, men have some duties which they must follow step by step.
At the first stage, it says: "...And (as to) those (women) on whose part you fear desertion, admonish them ..." For the second stage, it says: "…and avoid them in beds..." And, in the third stage, when the discord, disobedience, and the state of heedlessness toward the duties and responsibilities, the limits are transgressed, and the wife severely continues stubbornness and law breaking, so that neither admonishment nor separation from bed, nor heedlessness of man unto her, has any effect and avail, there remains no way save harshness.
So, it says: "...and beat them ..." It is certain, of course, that if one of these stages affects positively and the woman starts doing her duties, the man has no right to hurt her under any pretext. That is why, immediately after stating this phrase, the Qur'an continue saying: "...then if they obey you, do not seek a way against them...." At the end of the verse, it warns men again that they should not abuse their position of guardianship in the family.
They ought to think of Allah Whose Power is above all powers.