Dead Hearts and Empty Supplications

Assalamu Alaikum Warahmatullahi Wabarakatuhu 
(May the peace, mercy, and blessings of Allah be with you)

It is reported that Ibrahim b. Adham (May Allah have mercy on him) (d162H), once passed through the market of Basrah. People gathered around him and asked:

O Abu Ishaq, Allah the Exalted says in his Book. "Call on me, I will answer your prayers", but we have been calling on Him for a long time and He does not answer our prayers. [Ibrahim] replied, "O people of Basrah, your hearts have died in respect to ten things :

1. First, you know Allah but you do not give Him His rights;
2. Second, you have read Allah's Book but you do not act by it;
3. Third, you claim to love Allah's Messenger (Allah's peace and blessings be upon him) yet you abandon his Sunnah;
4. Fourth, you claim to be enemies to Shaytan but you conform to [his ways];
5. Fifth, you say you love Paradise yet you do not work for it;
6. Sixth, you say you fear The Fire yet you put yourselves closer to it [by sinning];
7. Seventh, you say death is true but you do not prepare for it;
8. Eighth, you busy yourselves with the faults of others and disregard your own;
9. Ninth, you consume the favors of your Lord but are not grateful for them; and
10. Tenth, you bury your dead but take no lesson from them."

Source : Abu Nu'aym, Hilyah Al-Awliya' 8: 15,16.

In this is a sufficient clarification of the fact that Allah guarantees the answering of the supplications. This is however, according to its conditions. Thus, we shall go into detail with the discussion concerning it, its description, its conditions, its proper time and place and its etiquettes, as well as what invalidates it.
May Allah (swt) guide us all and May Allah bless our prophet Mohammad (peace and blessing of Allah be upon him) and his family and his companions and his ummah insha'Allah.

Wassalam.