Prophet Muhammad (P.B.U.H&HF): Whenever one of you is needy and brings that to other people, he will not be satisfied. and Whenever someone is needy and brings that to Lord, he shall give him what he wants. sooner or later.
Imam Sadiq (As.): Whenever you had tenderness in your heart, Pray. because your heart doesn't get tender unless it's pure.
I told to Imam Baqir (A.S): “What is the meaning of “truly, Ibrahim was awwah and patient”? He replied: “Awwah means (the one who is) praying (to) and wailing (for God) a lot.””
“Two people, who have acted alike, enter the heaven, but one of them sees the other one in a higher place. Then, he says: O’ Lord! How come has he a superior place in comparison to me while we acted alike? God the Almighty replies: “because he asked Me (whatever he needed) and you did not do that”.
“The most knowledgeable person to God is the one who asks more from Him”
“Whoever prays a lot, the angels say: This voice is familiar (to us) and this is the supplication which is accepted and this is the need which is provided”
The Holy Prophet (peace be upon him and his Household):
وَ لَوْ عَرَفْتُمُ اللَّهَ حَقَّ مَعْرِفَتِهِ لَزَالَتِ‏ الْجِبَالُ‏ بِدُعَائِكُم‏
If you knew god the way you should’ve known, Mountains definitely will be moved by your supplications.
Crying out of fear of God is the key to his mercy, it’s a sign for his acceptance and it’s a door to answering [supplications]
Pray to God and believe in his answeres. But understand that God won't accept prays from an unwitting oblivious heart.

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Prayer Hadiths

What Happens When We Pray?

The Holy Prophet (peace be upon him and his Household):

“Whoever prays a lot, the angels say: This voice is familiar (to us) and this is the supplication which is accepted and this is the need which is provided”

Nahjod Dua (with Persian Translation); Vol. 1, p. 27.

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What happens when we pray

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Imam Hussain - Keys Of Salvation

Durat Ul-Razaweat

Collection Of Duas