Hijab Is Purity

Allah (SWT) had shown us the Hikma (Wisdom) behind the legislation of the Hijab:

وَإِذَا سَأَلْتُمُوهُنَّ مَتَاعًا فَاسْأَلُوهُنَّ مِنْ وَرَاءِ حِجَابٍ ذَلِكُمْ أَطْهَرُ لِقُلُوبِكُمْ وَقُلُوبِهِنَّ

"And when you ask them (the Prophet's wives) for anything you want, ask them from behind a screen, that is purer for your hearts and their hearts." (Qur'an 33:53)

The Hijab makes for greater purity for the hearts of believing men and women because it screens against the desire of the heart. Without the Hijab, the heart may or may not desire. That is why the heart is more pure when the sight is blocked (by Hijab) and thus the prevention of fitna (evil actions) is very much manifested. The Hijab cuts off the ill thoughts and the greed of the sick hearts:

‏ فَلَا تَخْضَعْنَ بِالْقَوْلِ فَيَطْمَعَ الَّذِي فِي قَلْبِهِ مَرَضٌ وَقُلْنَ قَوْلًا مَعْرُوفًا

"Be not soft in speech, lest he in whose heart is a disease (of hypocrisy or evil desire for adultery, etc.) should be moved with desire, but speak in an honorable manner." (Qur'an 33:32)