The Etiquettes of Dua (Supplication)

“O Moses! Let not your desires be too far, for it hardens your heart and a hard heart is distant from Me.”
2- The Dua recited by such a person is not answered, for Imam Sadeq (AS) has said:

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“God does not accept any Dua from a hard heart.”
Secondly- Weeping suggests man’s cutting off of hope with all but God and a sign of being humble, about which the Holy Prophet (SAW) has said:

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439. “Whenever God loves a servant, He will place a hue of sorrow in his heart, for He loves grief-stricken heart. One who is weeping out of fear for God, will not enter Hell so long as milk does not return to a mother’s breast. One who endeavors in the way of God, will never go to Hell. Whenever God hates a man, He will place in his heart a hymn of laugh which will make his heart wither. God does not love those who indulge in merrymaking.”
Thirdly- Weeping is concordant with God’s decree to His Messengers including to prophet Jesus (AS):

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440. “O Jesus! Bring to me as gift the tears of your eyes and the tear of your heart. Stand on the graveside of the deceased and call them loudly so that they will hear your sermon say to yourself: I too will join them. Shed tears for My sake and humble your heart to Me. O Jesus! Seek help from Me in hardships, for I will help the grief-stricken ones and answer the depressed ones, since I am the Most Merciful of the merciful ones.”
And in His revelation to Moses (AS) God says:

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441. “O Moses! When you are calling upon Me, you should be fearful, sympathetic and broken-hearted. Rub your face against the earth, and prostrate before Me with your best body parts. When you are standing before Me, raise your hands for begging in Qunut and invoke Me fearfully in supplication. During your lifetime, you must enliven My Torah, teach My virtues to the ignorant and remind them of My blessings and say to them: Do not ever keep on staying in bewilderment, for My chastisement will be painful.
O Moses! Let not your desires be too far in the world, for it will make you hardheated and the hardhearted are distant from Me. Let your heart wither from fear of Me, let your garment be old and torn but your heart new. Be unknown for the inhabitants of the earth and familiar for the inhabitants of heavens. Dwell at home and keep awake praying at night, be obedient to Me as the patient ones, cry out towards Me because of too many sins, cry out as a man who is escaping from the enemy and seek My assistance, for I am the Best Helper.”
God has also said:

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